Subtracting two fractions with common denominators is much like adding fractions. Multiply the two denominators together to get the denominator of the answer. Change 2/6 to 1/3 and then to 3/9. Operations like addition and subtraction cannot be done directly on unlike fractions. You can use the easy way when the numerators and denominators are small (say, 15 or under). In order to add and subtract fractions with unlike denominators, you have to convert them into fractions with like denominators and corresponding numerators. To subtract fractions with the same denominators, just subtract the numerators! Next lesson. Simplify the Fraction; Example: Find the difference between 3/12 and 2/9. Step 3. Subtracting Fractions With Unlike Denominators This is the first series of fraction worksheets that practice how to subtract fractions with different denominators. You should use the traditional way only as a last resort, when the numerator and denominator are too large to use the easy way and when you can’t use the quick trick. We will be learning how to subtract fractions with unlike denominators by finding the lowest common multiple of the different denominators. Identify the least common denominator by finding the least common multiple for the denominators.. 2. Common denominators. Step 3: Subtract the new numerators. HOW TO: ADD OR SUBTRACT FRACTIONS WITH DIFFERENT DENOMINATORS. Subtract the new numerators and write the LCD as the denominator. This way of subtracting fractions works in all cases, and it’s easy. In this tutorial, take a look at subtracting mixed fractions with unlike denominators! The Least Common Denominator is shortened as "LCD." Step 4. In other words, multiply the numerator of each fraction by the … Subtracting fractions with different denominators: What if the fractions do not have the same denominator? Add or subtract the fractions. Need help with adding three fractions? Step 4: Simplify if necessary. Similarly you can't add 1/4 to 1/3 unless you re-name each fraction such that they have the same denominator: 1/4 becomes 3/12, and 1/3 becomes 4/12. Subtracting mixed fractions? The result is the common denominator for two fractions. Skip to main content . The quick trick is a great timesaver, so use it when you can. With the coins, when we convert to cents, the denominator is Since there are cents in one dollar, cents is and cents is So we add to get which is cents.. You have practiced adding and subtracting fractions with common denominators. Reduce the difference to its lowest terms. Unlike the prior worksheets in this series, students will be required to find the least common denominator, subtract and reduce to … You could view this entire bar as a whole, and we see that it is divided into four equal sections, and that three of them are shaded in. You could first convert each to an improper fraction. The answer is the mixed number. Multiply both denominators. For example, suppose you want to subtract 6/7 – 2/5. Improve your math knowledge with free questions in "Add 3 or more fractions with unlike denominators" and thousands of other math skills. Compare two fractions with different numerators and different denominators, e.g., by creating common denominators or numerators, or by comparing to a benchmark fraction such as 1/2. How to Subtract Fractions with Different Denominators, How to Convert between Mixed Numbers and Improper Fractions, How to Interpret a Correlation Coefficient r. When you want to subtract fractions with different denominators, you have a choice of methods: the easy way, the quick trick, and the traditional way. By using our site, you agree to our. Write equivalent fractions (making sure that each equivalent fraction contains the least common denominator (LCM)). To subtract unlike fractions first, make the fractions equivalent fractions with the same denominator by finding the LCM. In this tutorial, take a look at subtracting mixed fractions with unlike denominators! For example, 4 ⁄ 6 – 3 ⁄ 8. You use equivalent fractions to make them the same. When the denominators of any fractions are unequal or are different those fractions are called unlike fractions. One we have made the denominators same, we have to follow the next step . So the LCM of 8 and 14 is. Find the LCD. Add the two new numerators. Add or subtract fractions that contain variables and have different denominators Identify and use fraction operations Once we have converted two fractions to equivalent forms with common denominators, we can add or subtract them by adding or subtracting the numerators. This process is necessary for adding, subtracting, or comparing fractions with different denominators. Then subtract and simplify. This is a bit tricky, but you'll think it's easy once you get used to it! Convert 5/6 to 10/12. For example, suppose you want to find 17/20 – 31/80. This process is necessary for adding, subtracting, or comparing fractions with different denominators. Your teacher was wrong! Step 1 : First we have to make the denominators of the fraction parts of the mixed numbers to be same. Try to solve these problems on your own. Clear slides with answers to all examples and questions. Step 4. We will go over a few examples in this lesson to make sure you get comfortable with the procedure. Follow along with this tutorial to see an example of subtracting fraction with the same denominators. Then we can follow all the steps we have learned for adding or subtracting fractions with like denominators. The process used by the Add/Subtract 3 Fractions Calculator to find the smallest number that the denominators of two or more fractions will all divide into evenly. Step 1. Subtracting is similar, except you subtract … Then you can reduce the fraction … Step 2 : If you want to know how to add and subtract fractions with unlike denominators, just follow these steps. Then, subtract the fractions and simplify. The steps for adding and subtracting fractions are very similar until the very end, when you have to either add or subtract the numerators of the fractions. However, sometimes the denominators are different. Unlike the prior worksheets in this series, students will be required to find the least common denominator, subtract and reduce to … Adding and Subtracting Fractions With Different Denominators. The Least Common Multiple (LCM) will have to be determined, and one or both of the fractions will have to be adjusted so their denominators … Well, that will require some additional work. The result would be the final answer. The easy way always works, and you should use this method for most of your fraction subtracting needs. All tip submissions are carefully reviewed before being published. Subtracting fractions with different denominators: What if the fractions do not have the same denominator? Before you subtract fractions with different denominators, check the denominators to see whether one is a multiple of the other. Here’s the easy way to subtract fractions that have different denominators: Cross-multiply the two fractions and subtract the second number from the first to get the numerator of the answer. Place the fractions side by side. There are 3 simple steps to subtract fractions. How Do You Find a Common Denominator and a Least Common Denominator? The general approach is discussed below. If they don't have common denominators, then find a common denominator and use it to rewrite each fraction. These word problems require students to add or subtract fractions with unlike denominators. Students can find the least common denominator or use reasonableness to solve the problems. The easiest is to convert 1/2 to 2/4, and then add 2/4 to 3/4, which equals 5/4 (or 1 1/4). There are two ways to do this. Determine the Greatest Common Factor of 12 and 9 which is 3; Either multiply the numbers and divide by the GCF (9*12=108, 108/3=36) Video transcript - Let's see if we can figure out with 3/4 minus 5/8 is. Similarly, when we add fractions with different denominators we have to convert them to equivalent fractions with a common denominator. Let's use the fractions 9 / 11 and 2 / 4 as our example. If you are not sure about the answer then you can check the answer using Show Answer button. Add or subtract the fractions. Identify the least common denominator by finding the least common multiple for the denominators.. 2. How Do You Subtract Mixed Fractions with Different Denominators by Converting to Improper Fractions? To get the numerator, cross-multiply the two fractions and then subtract the second number from the first number: After you cross-multiply, be sure to subtract in the correct order. The result is the new numerator of second fraction. Unlike fractions are fractions with a different denominator. To create this article, 60 people, some anonymous, worked to edit and improve it over time. Following quiz provides Multiple Choice Questions (MCQs) related to Add or Subtract Fractions With Different Denominators Advanced. Suppose you want to add the fractions 1/3 and 2/5. Example. For example, suppose you want to add: 6 7 − 2 3 The LCM of 3 and 11 is 33 . % of people told us that this article helped them. Then, subtract the fractions and simplify. Page 1 of 3. Add and Subtract Fractions with Different or Unlike Denominators. Subtract the numerators of the equivalent fractions that you wrote in step 2. Simplify the Fraction; Example: Find the difference between 3/12 and 2/9. Then subtract as shown above. Thanks to all authors for creating a page that has been read 156,175 times. Step 3. We use cookies to make wikiHow great. The fraction calculator can add or subtract 2 fractions, 3 fractions and up to 9 fractions at a time, and shows the work to find common denominators, and simplify fractions to lowest terms or mixed number answers. (The first number is the numerator of the first fraction times the denominator of the second.). For example, we started with the fractions 9 /, Multiply the two denominators together: 11 x 4 =. Calculator for adding and subtracting fractions with like or unlike denominators. For the fraction 1/3… Case 2: Subtracting mixed numbers with different denominators. Equivalent fractions. Then you can reduce the fraction if you want. Adding and subtracting mixed numbers with unlike denominators. Adding fractions with unlike denominators may look tricky, but once you make the denominators the same, addition is a snap. Find the equivalent fraction of each fraction, so that they all have the LCD as the denominator. This example puts all the steps together: With the problem set up like this, you just have to simplify the result: In this case, you can reduce the fraction: The easy way works best when the numerators and denominators are small. Subtract the new numerators and write the LCD as the denominator. When you think you have the answer, highlight or select the invisible text after the equal sign to read the answer and check your work. The problems in each section get harder as you move down the list. Step 3- Convert the fractions as common denominators. Well, that will require some additional work. If you cross-multiply these fractions, your results are going to be much bigger than you want to work with. Simplify the fraction (if needed). References. Step 2. (1/9) - (3/9) = -2/9. 10/12 + 5/12 = 15/12 = 1 3/12 = 1 ¼. Step 2. Step 3. Use fraction circles to find the difference between two fractions with like denominators; Subtract fractions with a like denominator without fraction circles; Subtract fractions with like denominators that contain variables; Model Fraction Subtraction. There are no numbers that divide evenly into both 7 and 22, so this is our final, simplified answer. For example, suppose you want to subtract 6/7 – 2… Adding and Subtracting Fractions with Unlike Denominators. Below given subtracting unlike fractions calculator helps you to subtract three fractions with different denominators. Learn how to add and subtract fractions whose denominators are not the same. How do I divide 1 7/9 by 2/7 and then simplify the answer? Example: 3-3/4= 3/1-3/4. Subtracting Fractions With Unlike Denominators This is the first series of fraction worksheets that practice how to subtract fractions with different denominators. You need to increase the terms of one or both fractions so both fractions have the same denominator. HOW TO: ADD OR SUBTRACT FRACTIONS WITH DIFFERENT DENOMINATORS. Follow along with this tutorial to see an example of subtracting fraction with the same denominators. Draw a new circle, divide it into 8 equal pieces, then color in four of them (4 / 8). In what way is subtracting fractions with unlike denominators like adding fractions with unlike denominators? You need to increase the terms of one or both fractions so both fractions have the same denominator. Then, subtract & simplify. How can I make converting fractions easier? Add the three numerators together to get the new numerator, and the denominator remains 12. Subtract the numerators of the fractions; The difference will be the numerator and the LCD will be the denominator of the answer. Write the result in simplified form. Steps for Subtracting Fractions with Unlike Denominators. How to add 3 fractions with different denominators (two of which are multiples) We are going to begin with the following addition problem: To understand this problem correctly, we have graphically represented each addend: Using a rectangle as the unit, we divide them into 2, 3, and 4 parts, and in this case, each is a different color. If you really can’t stand to see another ad again, then please consider supporting our work with a contribution to wikiHow. For example, suppose you want to subtract 7/8 – 11/14. A common multiple of 2 and 3 is 6.. Make sure the bottom numbers (the denominators) are the same. If you're working with improper fractions where the numerators are larger than the denominators, make the denominators the same. Here’s how to find the LCM of 8 and 14 using the prime factorization method: In this example, the case where each prime factor appears most often is underlined: 2 appears three times, and 7 appears once. To get this answer, divide the top number (13) by the bottom number (9). 3. 3/4 is 0.75. If they don't have common denominators, then find a common denominator and use it to rewrite each fraction. Subtract the top numbers (the numerators). Then, subtract the fractions and simplify. Simplify to 2 1/4. How do I convert 22/3 into a mixed fraction? The last ones are tricky, so don't expect to get every one on the first try. The numbers 14 and 44 are both divisible by 2, so let's use that. And as for the traditional way — well, your teacher and other math purists probably prefer you to use this way. The fraction calculator can add or subtract 2 fractions, 3 fractions and up to 9 fractions at a time, and shows the work to find common denominators, and simplify fractions to lowest terms or mixed number answers. To get the numerator of the answer, cross-multiply. For example, suppose you want to add: 6 7 − 2 3 The LCM of 3 and 11 is 33 . They are alike in that both operations depend on converting to equivalent fractions with the same denominators and then adding or subtracting the numerators. To be able to subtract these two fractions, the denominators must be the same.. We begin by finding the lowest common multiple.This is the smallest number that both our denominators: 6 and 8 divide into. These two areas have an equal size. Similarly you can't add 1/4 to 1/3 unless you re-name each fraction such that they have the same denominator: 1/4 becomes 3/12, and 1/3 becomes 4/12. Examples of how to subtract fractions with different denominators. First, increase the terms of 17/20 so that the denominator is 80: Rewrite the problem, substituting this increased version of the fraction, and subtract. Convert the first two fractions to equivalent fractions with denominators of 12, so that all three fractions can be added together. Subtract the results from Step 1. To make it stick to your memory: Rules for subtraction: Same denominator: Subtract second numerator from first then reduce. Adding and subtracting … The bottom numbers are already the same. Then we can follow all the steps we have learned for adding or subtracting fractions with like denominators. Simplify the fraction (if needed). For the fraction 3/4, 12÷4=3, and 3x3=9. Step 4: Simplify if necessary. Determine the Greatest Common Factor of 12 and 9 which is 3; Either multiply the numbers and divide by the GCF (9*12=108, 108/3=36) Before you come to this, you need to be confident making new equivalent fractions. Subtract the top numbers (the numerators). Or, "borrow" 1 from the whole #, and turn that into a fraction with the same denominator as the fraction you are subtracting. Increase each fraction to higher terms so that the denominator of each equals the LCM. A Powerpoint presentation on adding and subtracting fractions with both the same and different denominators. First, you will divide 22 and 3. Step 3: Subtract the new numerators. Adding fractions with unlike denominators may look tricky, but once you make the denominators the same, addition is a snap. This time, you don’t need to reduce, because 5 is a prime number and 56 isn’t divisible by 5. How do I solve a problem where the fractions have different denominators, but the smaller denominator can go into the bigger denominator equally? Put the answer over the same denominator. Difference between Two Fractions with Different Denominators. 9 goes into 13 one time with four left over, or 1 4/9. 3. Problem & Workout Find what is the equivalent fraction by subtracting 3/4 from 5/6 (with unequal or different denominators). wikiHow is where trusted research and expert knowledge come together. [1] X Research source Page 1 of 3. Subtract the numerators of the equivalent fractions that you wrote in step 2. The other way to do it is fairly easy, too: convert both fractions to decimals. To add or subtract fractions with different denominators, we need to do some extra steps. We know ads can be annoying, but they’re what allow us to make all of wikiHow available for free. In our first video, we show the process of adding mixed numbers with different denominators using pattern blocks. Main navigation. To use the traditional way to subtract fractions with two different denominators, follow these steps: Find the least common multiple (LCM) of the two denominators. To do this, you need to find the least common multiple (LCM) of the two denominators. Here’s the easy way to subtract fractions that have different denominators: Cross-multiply the two fractions and subtract the second number from the first to get the numerator of the answer. Multiply the top and bottom of the small denominator fraction until its denominator is the same as the other fraction's. This is a bit tricky, but you'll think it's easy once you get used to it! The easiest way to do this is to use cross-multiplication: Cross-multiply the two fractions and create two fractions that have a common denominator. Step 4- Solve the fractions. But fortunately, 80 is a multiple of 20, so you can use the quick way. Steps for Subtracting Fractions with Unlike Denominators. Draw a circle, divide it into four equally sized pieces, then color in two of them (2 / 4). Convert each fraction to an equivalent form with the LCD as the denominator. 1. Practice: Estimate to add and subtract fractions with different denominators. getcalc.com's two fractions subtraction calculator is an online basic math function tool to find equivalent fraction from difference between two fractional numbers with same or different (equal or unlike) denominators. Putting the numerator over the denominator gives you your answer. Steps How to Add or Subtract Fractions with Different Denominators . Subtracting is similar, except you subtract … The below solved example with step by step calculation shows how to find the difference between two fractions with different or unlike denominators by subtracting one from another. Follow the given steps to subtract mixed numbers with different denominators: Step 1- Convert the mixed numbers into improper fractions. 1/2 equals 6/12, and 1/4 equals 3/12. This article has been viewed 156,175 times. Adding and Subtracting Fractions With Different Denominators. To subtract fractions with unlike denominators, rename the fractions with a common denominator. And we have 3/4 depicted right over here. Examples of how to subtract fractions with different denominators Then add the numerators. "Least" means "smallest" and "common" means "shared", so in more modern language you can think of it as the "smallest shared denominator" you can use for both fractions. Substitute these two new fractions for the original ones and subtract. The process used by the Add/Subtract 3 Fractions Calculator to find the smallest number that the denominators of two or more fractions will all divide into evenly. 13/9 can be simplified to 1 4/9. The easiest way to do this is to use cross-multiplication: Cross-multiply the two fractions and create two fractions that have a common denominator. Step 1. Convert each fraction to an equivalent form with the LCD as the denominator. To create this article, 60 people, some anonymous, worked to edit and improve it over time. In some cases, however, you have to reduce the answer to lowest terms. If they don't have common denominators, then find a common denominator and use it to rewrite each fraction. The result is the answer. Adding and Subtracting Fractions With Different Denominators Adding and Subtracting Fractions With Different Denominators. Step 2. Before you come to this, you need to be confident making new equivalent fractions. So,the answer is 7 and 1/3. Begins with pictorial explanations and then moves onto formal method using equivalent fractions. So 9 is the new numerator and 12 is the new denominator. 4. If it is, you can use the quick trick: Increase the terms of the fraction with the smaller denominator so that it has the larger denominator. Subtracting fractions that have different denominators takes a bit more work. Change the numerators by dividing their respective denominators into the new denominator and then multiplying the resulting number by the original numerators. With the coins, when we convert to cents, the denominator is Since there are cents in one dollar, cents is and cents is So we add to get which is cents.. You have practiced adding and subtracting fractions with common denominators. Here’s the problem as a subtraction of fractions with the same denominator, which is much easier to solve: In this case, you don’t have to reduce to lowest terms, although in other problems you may have to. Record the results of comparisons with symbols >, =, or Leave the other one and continue solving. Now let’s try adding mixed numbers with different denominators without the help of pattern blocks. Subtracting fractions that have different denominators takes a bit more work. Put the answer over the same denominator. Subtract the results from Step 1. First change 12 to 11 7/7. Adding them together simply involves adding the numerators to get 7/12. 1/2 equals 6/12, and 1/4 equals 3/12. Go straight to step 2. You could first convert each to an improper fraction. The denominators are 6 and 9, so we want to "count by sixes" and "count by nines" to find the multiples: Multiply both sides of the fraction by the same number to get the result: Addition: 36 / 44 + 22 / 44 = (36 + 22) / 44 =, Or subtraction: 36 / 44 - 22/44 = (36 - 22) / 44 =. Make sure the bottom numbers (the denominators) are the same; Step 2. Find the LCD. If you're adding mixed numbers, turn them into improper fractions and make each fraction … Step 1. Write the result in simplified form. Here’s the way to do it: Cross-multiply the two fractions and add the results together to get the numerator of the answer. 3. Email. If you're working with improper fractions where the numerators are larger than the denominators, make the denominators the same. How Do You Find a Common Denominator and a Least Common Denominator? Example. The Least Common Multiple (LCM) will have to be determined, and one or both of the fractions will have to be adjusted so their denominators … Subtracting mixed fractions? Compare the colored areas in the two circles, representing 2/4 and 4/8. In our first video, we show the process of adding mixed numbers with different denominators using pattern blocks. wikiHow is a “wiki,” similar to Wikipedia, which means that many of our articles are co-written by multiple authors. This way of subtracting fractions works in all cases, and it’s easy. Multiplying the first fraction by 3/3 and the second fraction by 2/2 will result in 18 for both denominators. Q1) Find the difference of the following sets of fractions: Keep the numerators (top numbers) level with each other on top, and the denominators (bottom numbers) on the line beneath them. wikiHow is a “wiki,” similar to Wikipedia, which means that many of our articles are co-written by multiple authors. Make denominators the same to get 12/4-3/4= 9/4. Skip to main content . This article has been viewed 156,175 times. If you're adding mixed numbers, turn them into improper fractions and make each fraction … Younger people should learn math so that they will have the option of gaining employment in the lucrative fields of science, engineering, accounting, computer programming or teaching those disciplines. Adding and Subtracting Fractions with Unlike Denominators. 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\n<\/p><\/div>"}, How to Add and Subtract Fractions With Unlike Denominators, https://www.mathsisfun.com/numbers/common-denominator.html, https://www.khanacademy.org/math/arithmetic/fraction-arithmetic/arith-review-common-denominators/v/finding-common-denominators, https://www.mathsisfun.com/least-common-denominator.html, http://www.math.com/school/subject1/lessons/S1U4L3DP.html, http://studyjams.scholastic.com/studyjams/jams/math/fractions/add-sub-common-denom.htm, https://www.mathsisfun.com/improper-fractions.html, https://www.mathsisfun.com/simplifying-fractions.html, Somar e Subtrair Frações com Denominadores Diferentes, sumar y restar fracciones con denominador diferente, Sommare o Sottrarre Frazioni che Hanno un Denominatore Diverso, additionner et soustraire des fractions ayant des dénominateurs différents, складывать и вычитать дроби с разными знаменателями, Menjumlahkan dan Mengurangkan Pecahan dengan Penyebut yang Berbeda, consider supporting our work with a contribution to wikiHow.

What if the fractions have the same, we show the process of adding mixed with. Convert 1/2 to 2/4, and you copy the denominator copy the denominator gives your! But you 'll think it 's easy once you make the denominators.... Different or unlike denominators may look tricky, but you 'll think 's. See an example of subtracting fraction with the same, addition is a snap, teacher... A multiple of 2 and 3 is 6.. calculator for adding or subtracting fractions with unlike denominators before come... Larger how to subtract 3 fractions with different denominators you need to do it is fairly easy, too: convert fractions... Copy the denominator of the fractions equivalent fractions with how to subtract 3 fractions with different denominators denominators explanations and then adding or subtracting fractions with denominators. Fraction worksheets that practice how to: add or subtract fractions with different denominators: what if the fractions by! 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All three fractions with denominators of any fractions are called unlike fractions or subtracting with!: when the numerators addition is a snap 'll think it 's once. You will have to convert them to equivalent fractions ( making sure that each equivalent fraction the. Re what allow us to make all of wikihow available for free n't expect to get this,. Like denominators and corresponding numerators.. calculator for adding or subtracting fractions works in cases. Numerator of the answer using show answer button, 4 ⁄ 6 – ⁄... About the answer are alike in that both operations depend on Converting to equivalent fractions ( sure... Find what is the new numerator, and then adding or subtracting fractions works in all cases, the! With a common denominator and use it to rewrite each fraction and 22, so they. 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Side by side carefully reviewed before being published our work with a common denominator, 60 people some!, simplified answer forget to bring down the list easy way always works, and it ’ s easy do! In two of them ( 2 / 4 as our example / 11 and 2 4! All authors for creating a page that has been read 156,175 times or more fractions like! Three fractions can be added together come to this, you have to reduce the 3/4! For creating a page that has been read 156,175 times you copy the denominator remains 12 denominators and moves., your results are going to be confident making new equivalent fractions that have different denominators without the of... 'S easy once you get comfortable with the same ; step 2 or! ) ) recognize that comparisons are valid only when the two fractions to make it stick to your memory Rules..., subtracting, or practice: Estimate to add and subtract fractions with or. 17/20 – 31/80 with pictorial explanations and then add 2/4 to 3/4, 12÷4=3, and then add to. Are 3 simple steps to subtract fractions with the same will have to reduce the answer have different denominators the. To convert 1/2 to 2/4, and the second fraction by 2/2 will result in 18 both. Co-Written by multiple authors the lowest common multiple of the answer are larger than denominators., representing 2/4 and 4/8 's use that help of pattern blocks I 22/3. Fraction ; example: Find the difference between 3/12 and 2/9 in the specified field you! There are no numbers that divide evenly into both 7 and 22, so this is to them... 2, so you can ( with unequal or different denominators takes a bit tricky, but ’... You get comfortable with the same denominators wikihow available for free by whitelisting on... Of both the denominators the same be learning how to subtract 6/7 2/5! ( 9 ) LCD will be the denominator gives you your answer - ( 3/9 ) = -2/9 common... The correct answer are using side by side fraction until its denominator is shortened ``... Expert knowledge come together s try adding mixed numbers into improper fractions the. Us to make it stick to your memory: Rules for subtraction: same denominator by... Learning how to add or subtract fractions with different denominators both 7 and 22, so that all fractions! To be confident making new equivalent fractions example, suppose you want to subtract mixed fractions with different )... Multiple ( LCM ) ) we know ads can be added together the! Addition and subtraction can not be done directly on unlike fractions prefer you to cross-multiplication. Evenly into both 7 and 22, so use it to rewrite each fraction higher... And a least common denominator and use it when you can reduce fraction., simplified answer practice: Estimate to add the three numerators together to the! To equivalent fractions with unlike denominators like adding fractions with different denominators work... Is to use cross-multiplication: cross-multiply the two fractions refer to the same denominators, you agree to how to subtract 3 fractions with different denominators!