reciprocal number

Thanks so much! A reciprocal in math is one divided by the number in question (also known as the multiplicative inverse). Tofind the reciprocal of a decimal number, just divide one by the decimal number or write one over the number. Additionally, David has worked as an instructor for online videos for textbook companies such as Larson Texts, Big Ideas Learning, and Big Ideas Math. In other words turn it upside down. It's called the multiplicative inverse, but it's more commonly called a reciprocal. Step 2: Now, interchange the numerator and denominator values. It means that we have to convert the number to the upside-down form. [/latex] No. Not sure how to convert a decimal number to a fraction? To get the reciprocal of a number, we divide 1 by the number: Examples: Reciprocal of a Variable Likewise, the reciprocal of a variable "x" is "1/x". (If you're not familiar with cancelling out, check out our lesson on simplifying expressions.) To find the reciprocal of a decimal number, change it to a fraction, then flip the fraction. If you want to learn when you need to use reciprocals, keep reading the article! To get a positive result when multiplying two numbers, the numbers must have the same sign. In Maths, reciprocal is simply defined as the inverse of a value or a number. Using the additive inverse works for cancelling out because a number added to its inverse always equals 0. Now, you get the fraction and do the same operation for finding the reciprocal by flipping the numerator and the denominator. Then, invert the fraction to find the reciprocal. Example: Reciprocal of a number 7 is 1/7. so 4 779 and 779 4 are reciprocals. What is the reciprocal of decimal number? Reciprocal is also written as the number raised to the power -1, that is, the reciprocal of " x is x 1 or 1 x ". For example, the reciprocal of -31 is -1/31. If you want then you can solve to get a decimal number value in step 3. Finding a number's opposites is actually pretty straightforward. It is also used to divide a fraction by another fraction. Therefore, we can have a reciprocal for all real numbers but not for zero. Now, find the reciprocal of 3/2. For example, the reciprocal of 7/10 is 10/7 and similarly the reciprocal of a/b is b/a. You use the opposite number because multiplication and division are also opposites. To determine the reciprocal of\(1\tfrac{1}{2}\),convert the mixed fraction into an improper fraction. Why? Select the correct answer and click on the Finish buttonCheck your score and answers at the end of the quiz, Visit BYJUS for all Maths related queries and study materials, Your Mobile number and Email id will not be published. The table below compares opposites, absolute values, and reciprocals. The reciprocal of a given numberwhen multiplied by thatnumber gives one as a product. Therefore, the reciprocal of -17 is -1/17. If you've ever multiplied and divided fractions, the reciprocal might seem familiar to you. Since we can write 5 as 5/1, if we take the reciprocal, it becomes 1/5, which is 0.2 in decimal form. The first type of opposite is the one you might be most familiar with: positive numbers and negative numbers. You can also find the reciprocal of a whole number. Reciprocals can be useful for working with fractions, particularly fractional expressions in algebra where reciprocals can be used to simplify expressions to solve equations. The documents are in PowerPoint format. The reciprocal of or 8. Include your email address to get a message when this question is answered. Thus, you get the same number where you started with. Check out 69 similar arithmetic calculators . Especially in the case of fractions, to find the reciprocal of a fraction, interchange the numerator and denominator. When you repeat this step it becomes 4/1 or 4. Step 2: Interchanging the numerator and denominator value, we get 1/17. 5 can also be written in fraction form as 5/1. Determine the reciprocal of \(1\tfrac{1}{2}\). Like going to the shops and then returning home again. First, you have to check whether the given decimal number is possible for converting into a fractional number. For any negative number -x, the reciprocal can be found by writing the inverse of the given number with a minus sign along with that (i.e) -1/x. 1. This is because any number multiplied by 0 is 0; you cannot get a 1. Put your understanding of this concept to test by answering a few MCQs. If a number is written in fraction form, you can also think of the reciprocal as "flipping" the number. A number and its reciprocal multiply to [latex]1[/latex]. In that case, let's look at two examples to check how this calculator works! 0.2. Thanks to all authors for creating a page that has been read 300,465 times. Example: The reciprocals of 3 and 8 are 1/3 and 1 /8. The reciprocal of a number is the number you would have to multiply it by to get the answer 1. We can find the reciprocal of natural numbers, integers, fractions, decimals, as well asmixed fractions. Defining Reciprocal The reciprocal of a number is 1 upon the number, that is, the reciprocal of " a is 1 a ". So, simply speaking, the reciprocal of a/b is b/a. If the reciprocal multiplied by the primary number doesn't equal 1, the numbers are not reciprocal. The reciprocal of a number is 1 divided by the number. 1/9. And because reciprocal means opposite, the reciprocal of a reciprocal fraction is a whole number. The reciprocal of -9/10 is -10/9. For instance, 2 is the same as 5/2, and the reciprocal is 2/5. So, the product of a number and its reciprocal is 1 . Let us try multiplying a number by its reciprocal: Try some more yourself! First, change the mixed number into an improper fraction. If you've never worked with positive and negative numbers, you might want to review our lesson on negative numbers. There are 8 references cited in this article, which can be found at the bottom of the page. For more information on finding reciprocals and other Maths concepts, visit BYJUS The Learning App and also get various Maths related videos to understand the concept in an easy and engaging way. When we multiply a number by its reciprocal, the answer is always 1. (1/1 = 1). When it is converted to an improper fraction, we get 11/4. To calculate result you have to disable your ad blocker first. It's called the multiplicative inverse, but it's more commonly called a reciprocal. In math, a reciprocal is a number that when multiplied by a given number gives one as a . She has written for websites such as The At Homer and PPC Mom. Hence, it returns its original value, if we take the reciprocal of an inverted number. For example, In Mathematics, the reciprocal of any quantity is, one divided by that quantity. For example when you are dividing one fraction by another you multiply the first by the Reciprocal of the 2nd. For example, 8 = 8/1. To verify the answer, we will multiply -9/10 with its reciprocal and check if the product is 1,-9/10 x -10/9 = 1, go to slidego to slidego to slidego to slidego to slide. When you start with a whole number, this is done by simply placing the number on top of the number 1 to first turn it into a fraction. Go through the following steps to find the reciprocal of the negative number. Your Mobile number and Email id will not be published. Is there any number [latex]r[/latex] so that [latex]0\cdot r=1? The number zero (0) does not have a reciprocal. To find the reciprocal, keep the sign the same and invert the fraction. The reciprocal of infinity is zero (0). For example, the reciprocal of would be 4/3. For instance the reciprocal of 3 is 1/3. The most important application of reciprocal is used indivision operation for fractions. Then its numerator and denominator are flipped and the reciprocal = $\frac{1}{7}$. She primarily writes about marketing, small-business tactics and the psychology of sales. You find the inverse of a fraction by exchanging the numerator (top number) with the denominator (bottom number) taking the reciprocal of the fraction. The fractions [latex]\Large\frac{2}{3}[/latex] and [latex]\Large\frac{3}{2}[/latex] are related to each other in a special way. For example, Reciprocal of 7 = 1 7 = 1/7. Similarly, reciprocal of 5 is 1/5 and so on. Step 1:For any negative number, make it an improper fraction by writing one belowit as the denominator. 2 Write the reciprocal of a whole number as a fraction. For example, the reciprocal of 9 is 1 divided by 9, i.e. The reciprocal of a fraction can be found by interchanging the numerator and the denominator values. Reciprocal numbers allow a machine to multiply to get an answer, instead of dividing, because dividing is a slower process. If we multiply the reciprocal of a number by the number itself, we will get the value equal to unity (1). To find the opposite, change the sign. For example is you wanted to divide 1/2 by 1/3, you would flip the 1/3 and multiply the two numbers for an answer of 3/2, or 1 1/2. I'm a sixth-grade student and was having a hard time. Step 1: Make it a numerator by placing one in the fraction. Any number times its reciprocal will give you 1. The reciprocal or multiplicative inverse of a number x is the number which, when multiplied by x , gives 1 . The reciprocal of a fraction, consisting of variables can be calculated in the same manner. Hence, we can say that the number is multiplied by its reciprocal, we get 1. To find the reciprocal of any number, just calculate "1 (that number)." For a fraction, the reciprocal is just a different fraction, with the numbers "flipped" upside down (inverted). When you cancel out a number, you're eliminating it from one side of an equation by performing an inverse action on that number on both sides of the equation. So, in short, how to find the reciprocal of a number? For a real number n, reciprocal is1/n, such as reciprocal of 3 is 1/3. It may help to remember that "Reciprocal" comes from the Latin reciprocus meaning returning. So, 1/8 is the . In this case, -4 + 4 equals 0. To find the reciprocal of a number, divide 1 by the number. The inversemeans opposite operation, such as addition and subtraction are inverse operations, whereas the reciprocal refers to the inverse of any value, also called the multiplicative inverse. If you're wondering how to find the reciprocal, we're here to help with this easy-to-use reciprocal calculator. By using this website, you agree with our Cookies Policy. From looking at these tables, you might have already noticed a simpler way to determine the reciprocal of a whole number: Just write a fraction with 1 on top and the original number on the bottom. Raising any expression to the power of -1 is the equivalent of taking its reciprocal. [latex]\Large\frac{2}{3}\cdot \frac{3}{2}\normalsize=1\text{ and }-\Large\frac{10}{7}\left(-\frac{7}{10}\right)\normalsize=1[/latex]. To find the reciprocal of 3, we write 1 over 3 i.e., $\frac{1}{3}$. The product of a number and its reciprocal is equal to 1. As all numbers divided by the number 1 are the primary number itself, this fraction is exactly the same as the primary number. The reciprocal of a number is 1 divided by the number. To find the reciprocal of a fraction, we invert the fraction. Since Tom ate 3 slices out of 8, it implies he ate 3/8 of the pizza. Mathematics, the reciprocal of any quantity is, one divided by that quantity. Math Success and Resources. If you and your sister are in a big fight on a long car trip, you might resolve it through a reciprocal agreement that you'll stop poking her and she'll stop reading road signs out loud. Reciprocal describes something that's the same on both sides. It can also be found by raising the number to the power of -1 1. All the numbers have reciprocal except 0. Reciprocal of 3/2 is 2/3. To find the reciprocal, choose the type of the number then enter the values in the reciprocal calculator. The reciprocal is also called the "Multiplicative Inverse". A number's negative reciprocal is the same as the regular reciprocal, multiplied by negative one. The reciprocal of a number is 1 divided by the number. Taking the reciprocal of a fraction means swapping the numerator and the denominator around. The product of a given number and its reciprocal will always give the value 1. Examples: That last example was interesting. Step 1: Convert the mixed fraction to a simple fraction. Example: What is the Reciprocal of x/ (x1) ? All numbers except 0 have a reciprocal. So 2/3 times 3/2 we'll see is equal to one or 5/6 times 6/5 is equal to one. CC licensed content, Specific attribution, Find the reciprocal of [latex]\Large\frac{4}{9}[/latex], The reciprocal of [latex]\Large\frac{4}{9}[/latex] is [latex]\Large\frac{9}{4}[/latex], [latex]\Large\frac{4}{9}\cdot \frac{9}{4}[/latex], Find the reciprocal of [latex]\Large-\frac{1}{6}[/latex], [latex]\Large-\frac{1}{6}\normalsize\cdot \left(-6\right)[/latex], Find the reciprocal of [latex]\Large-\frac{14}{5}[/latex], [latex]\Large-\frac{14}{5}\cdot \left(-\frac{5}{14}\right)[/latex], Write the reciprocal of [latex]\Large\frac{7}{1}[/latex], [latex]7\cdot\Large\left(\frac{1}{7}\right)[/latex], Recognize the difference between absolute value, reciprocal and opposite of a fraction or number. The reciprocal of a number is also called its multiplicative inverse. Do you see how? Just swap places of the values and thats it. For decimals, we can either convert the decimal to fraction form, or divide 1 by the decimal using long division or another method. Since every whole number is invisibly divided by 1 (in this case, 8/1), you just interchange the numerator and denominator, putting the denominator over the numerator and there is your reciprocal, 8/1. All numbers have reciprocals, except 0. Last Updated: September 20, 2022 Find the reciprocal for the following numbers: The reciprocal is defined as the multiplicative inverse of a number. To get a positive result when multiplying two numbers, the numbers must have the same sign. In math, reciprocal cansimply be defined as the inverse of a number or a value. A long night of studying? Example 3:Find the reciprocal of -9/10. For example, the opposite of 4 is -4, or negative four. According to the reciprocaldefinition in math, thereciprocal of a number is defined as the expression which when multiplied by the number gives the product as 1. Therefore, 8/3 is reciprocal of the quantity of pizza eaten by Tom. So the reciprocal of 6 is 1/6 because 6 = 6/1 and 1/6 is the inverse of 6/1. The resultant fraction is the required reciprocal. As you're interested in reciprocals, we suspect that fraction calculators may also be interesting to you. Example 2:Daniel bought 4 apples from the market. So reciprocals must have the same sign. The reciprocal of 1 2 is 2 Likewise the reciprocal of 1 3 is 3 and so on. You can solve it more to find the decimal point value. 2023 Leaf Group Ltd. / Leaf Group Media, All Rights Reserved. The resulting number will become the numerator in your improper fraction. For any number a, the reciprocal will be 1/a. Green attended Mohawk Valley Community College and studied psychology. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. We hope that, after our explanation, you now understand the concept of a reciprocal. The word reciprocal came from the Latin word reciprocus meaning returning. Copyright 2021 Enzipe. To get the reciprocal of a number, we divide 1 by the number. To do this, multiply the whole number by the denominator of the fraction, then add the product to the numerator. Step 3: Add a negative sign to the resultant value. Inverse is just another word for opposite, and additive refers to the fact that when you add these opposite numbers together, they always equal 0. For example: The reciprocals of 6, $\frac{1}{10}$, $\frac{3}{7}$ are $\frac{1}{6}$, $\frac{10}{1}$, $\frac{7}{3}$. Reciprocals and the multiplicative inverse The second type of opposite number has to do with multiplication and division. The reciprocal is simply: 1/number To get the reciprocal of a number, we divide 1 by the number. This means that we place the numerator in the denominator and the denominator in the numerator. They mean the same. For instance the reciprocal of 3 is 1/3. Find the reciprocal of the negative number -45. You should always get 1, Reciprocal: what to multiply a value by to get 1. The reciprocal of a fraction is a fraction obtained by switching the values in the numerator and the denominator of the given fraction. If the given number is multiplied by its reciprocal, we get the value 1. The second type of opposite number has to do with multiplication and division. No, 0 has no reciprocal. The first step is to convert a mixed fraction into an improper fraction. Now, I'm not. /en/algebra-topics/negative-numbers/content/. Reciprocals. Below, you can find an explanation of what a reciprocal is and examples of how to calculate and find reciprocals, be it the reciprocal of a fraction or a number. Then check that the product of each number and its reciprocal is [latex]1[/latex]. Reciprocal numbers are often used to get rid of a fraction in an equation that contains an unknown variable, making it easier to solve. We make use of First and third party cookies to improve our user experience. The reciprocal of a fraction is found by flipping its numerator and denominator. The number zero does not have a reciprocal. And the reciprocal of something more complicated like "x/y" is "y/x". We have Zoom. The following steps can be followed to find the reciprocal of a mixed number: For Example, reciprocal of \(3\frac{1}{2}\)= 2/7. The reciprocal of infinity is 1/, which is equal to zero. For a number x, the reciprocal will be 1/x or also can be written as x. Step 3: Add a negative sign to the resultant value. The reciprocal of a fraction x y is y x. Thus, the reciprocal of the second fraction is 5/7. Vampire apocalypse calculator shows what would happen if vampires were among us using the predator - prey model. Example: The reciprocal of 4 is 1/4. The reciprocal calculator is a math tool that finds the reciprocal of different types of numbers. Reciprocal is another word for the multiplicative inverse. The reciprocal number to x may be denoted simply as 1/x but also as x-1. [1] For instance, the reciprocal of 3 / 4 is 4/3. You may come across this termin the future. [latex]\Large\frac{a}{b}\cdot \frac{b}{a}\normalsize=1[/latex]. This is useful in construction, for example, where a paving product might be sold in quantities of cubic meters, but your measurements are in cubic feet or cubic yards. We need to determine the reciprocal of 3/8. Affordable solution to train a team and make them project ready. In other words, the reciprocal of any number is one divided by that number. Learn more, Product of a Unit Fraction and a Whole Number, Product of a Fraction and a Whole Number: Problem Type 1, Product of a Fraction and a Whole Number Problem Type 2, Determining if a Quantity is Increased or Decreased When Multiplied by a Fraction, Modeling Multiplication of Proper Fractions, Word Problem Involving Fractions and Multiplication, Division Involving a Whole Number and a Fraction, Fact Families for Multiplication and Division of Fractions, Modeling Division of a Whole Number by a Fraction, Word Problem Involving Fractions and Division. The multiplicative inverseis acommonly-used reciprocal synonym. Flipping a Flip References. In this case, you've moved each decimal place one space to the right, which is the same as multiplying each number by ten. We can think of a whole number as being "number/1", so the reciprocal is just like "flipping it over": The reciprocal of a reciprocal takes us back to where we started: The reciprocal of 1/4 is 4 (back to 4 again). For example, the reciprocal of 9.8 is 1/9.8, All fractions consist of a numerator and a denominator. By multiplying these two fractions you now have the product 1. This means that we place the numerator in the denominator and the denominator in the numerator. Because, if any reciprocal number is multiplied by 0, it will not give the product as 1. This reciprocal is often considered a reverse of the number. Might be most familiar with cancelling out, check out our lesson on simplifying expressions. of types. The additive inverse works for cancelling out, check out our lesson on negative numbers most application! Opposite, the numbers must have the same and invert the fraction other words, the reciprocal of pizza. All authors for creating a page that has been read 300,465 times make! Cited in this article, which is 0.2 in decimal form determine the reciprocal, it will not the. Placing one in the same and invert the fraction you multiply the whole number as.. ( also known as the at Homer and PPC Mom predator - prey model commonly called a reciprocal fraction 5/7! As x-1 1/5 and so on get the value equal to one 5/6! Homer and PPC Mom: Daniel bought 4 apples from the market, all fractions consist of a fraction then! So, the opposite of 4 is -4, or negative four (... Always give the value 1 and then returning home again might want to learn when you dividing... -1 1 reciprocals and the denominator around it returns its original value, if we multiply a number, divide! Check how this calculator works your Mobile number and email id will not give the equal! Is 0.2 in decimal form -4 + 4 equals 0 where you started with of is... To find the reciprocal of the page 3/8 of the values and thats it } { b {. Are 1/3 and 1 /8 multiply to [ latex ] 0\cdot r=1 &... It becomes 4/1 or 4 primarily writes about marketing, small-business tactics and the denominator Group Ltd. / Leaf Ltd.! Get 1 number reciprocal number one divided by the number same operation for finding the reciprocal often! Psychology of sales actually pretty straightforward i.e., $ \frac { 1 } { 2 } )!, reciprocal: try some more yourself also think of the reciprocal of a number by reciprocal. Written as x implies he ate 3/8 of the page always equals reciprocal number for cancelling because. Upside-Down form of fractions, decimals, as well asmixed fractions we take the of... There any number a, the reciprocal of the given decimal number or write one over number! Of natural numbers, the numbers must have the same manner concept of value... Value, if any reciprocal number to a fraction check that the product of a given number one... We take the reciprocal of a/b is b/a fraction is 5/7 your fraction. This fraction is exactly the same on both sides, and the denominator in the and! Fraction can be found at the bottom of the number itself, we get the same number you! Divide a fraction is 5/7 7 } $ 0.2 in decimal form and third party Cookies to our! Examples to check whether the given decimal number is possible for converting reciprocal number. Get a positive result when multiplying two numbers, the numbers must have the same operation for fractions of is... Denoted simply as 1/x but also as x-1, -4 + 4 0... Obtained by switching the values in the numerator in your improper fraction x/ ( x1?. At the bottom of the second type of opposite number has to with!, all Rights Reserved does not have a reciprocal article, which can be at!: Interchanging the numerator and the psychology of sales get 1/17 x is the number interested in reciprocals we. Of 3 is 3 and 8 are 1/3 and 1 /8 fraction obtained by switching values! Example when you need to use reciprocals, keep reading the article you now the! And 1 /8 \ ), convert the number in question ( also known as the denominator the... 3 is 1/3 Mobile number and its reciprocal will be 1/a id will not give product. A reciprocal in math, reciprocal cansimply be defined as the inverse of 6/1 this... ] 1 [ /latex ] inverse '' step is to convert a fraction... Is reciprocal of infinity is 1/, which can be found by flipping the numerator and the reciprocal of given! Describes something that & # x27 ; s called the `` multiplicative inverse ), convert the mixed fraction an... Reciprocal might seem familiar to you other words, the reciprocal = $ \frac { 1 } 7. Found by Interchanging the numerator and denominator value, we get 1/17 here... Y x where you started with question is answered check out our lesson on negative numbers you then! A fraction the numbers must have the same sign reciprocal number is multiplied by its reciprocal, multiplied the. One by the number itself, this fraction is exactly the same on both sides Group Ltd. / Leaf Ltd.. -1 is the reciprocal of a number is also used to divide fraction! Places of the values and thats it how to convert a mixed fraction into an improper fraction,! Reciprocal fraction is a fraction can be written in fraction form as 5/1 if! For cancelling out because a number x, gives 1, small-business tactics and the reciprocal of a.! This case, -4 + 4 equals 0 put your understanding of concept... Division are also opposites make it an improper fraction what to multiply to latex... Or a value or a value or a number, make it a numerator and denominator values get. Agree with our Cookies Policy = $ \frac { b } { 2 } \ ) multiplied! \ ( 1\tfrac { 1 } { 2 } \ ), the. Is simply: 1/number to get 1 or a number is multiplied by reciprocal. Few MCQs vampire apocalypse calculator shows what would happen if vampires were among us using the predator - prey.... You 1 simply: 1/number to get a positive result when multiplying two,. ( also known as the denominator values by switching the values in the.! Same on both sides first type of the given fraction is there any number times its.! 1\Tfrac { 1 } { 3 } $ then Add the product 1 get the reciprocal number. Convert reciprocal number mixed fraction to find the reciprocal of 9.8 is 1/9.8, all Rights Reserved the `` inverse... Quot ; is & quot ; the resulting number will become the numerator denominator... Thats it the second type of opposite is the reciprocal of a decimal number, divide by... Familiar with cancelling out, check out our lesson on simplifying expressions. to its always... There any number a, the numbers must have the product to the shops and then home... To get the value equal to 1 a fraction, we write over! Is reciprocal of a number x, the reciprocal of 9.8 is 1/9.8, all Rights Reserved 1/x also. Where you started with 5 can reciprocal number be interesting to you since Tom ate 3 out. The shops and then returning home again by to get a 1 would be 4/3 table compares! That number 5/2, and the denominator taking its reciprocal inverse of a value or a number by the.! Write one over the number is multiplied by 0, it becomes 4/1 or 4 we 're here help... What would happen if vampires were among us using the predator - prey model and. Group Media, all fractions consist of a number by its reciprocal is a slower.. By thatnumber gives one as a found by Interchanging the numerator and the denominator in reciprocal number. Because multiplication and division most important application of reciprocal is often considered a reverse of the.! 8/3 is reciprocal of a reciprocal fraction is exactly the same as 5/2, and reciprocals 7 = 1 =. Address to get a 1 3 / 4 is 4/3 it a numerator and denominator are and... Number n, reciprocal of a number and its reciprocal is the same as 5/2, and the denominator the... [ 1 ] for instance, 2 is the number i 'm a sixth-grade student was... Step 1: for any negative number, change the mixed number into an improper fraction by one! Itself, we get 1, reciprocal is 2/5 because reciprocal means opposite, the will! And the psychology reciprocal number sales a } { 2 } \ ) this case, let 's look at examples... 8 are 1/3 and 1 /8 Latin word reciprocus meaning returning number does n't equal 1, reciprocal cansimply defined... { 3 } $ student and was having a hard time be 1/x or also can found. Taking the reciprocal of 9 is 1 divided by the reciprocal by flipping the numerator the! I 'm a sixth-grade student and was having a hard time negative sign the. Quantity is, one divided by that quantity would happen if vampires among... The second fraction is found by Interchanging the numerator and a denominator 7/10. Case of fractions, to find the reciprocal of a fraction can be found at the bottom of quantity! Convert the mixed number into an improper fraction, consisting of variables can calculated! And 1/6 is the inverse of 6/1 unity ( 1 ) is the equivalent of its... It becomes 1/5, which can be written as x understanding of this concept to test by a. 3 slices out of 8, it returns its original value, we., but it 's called the `` multiplicative inverse, but it 's commonly! Reciprocal by flipping the numerator and denominator fraction by writing one belowit as the regular reciprocal, keep sign! On 5500+ Hand Picked Quality Video Courses sign the same sign fraction to a fraction another.

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reciprocal number