# Subtraction of Fractions With Common Denominators

## Printables also let pupils find the lowest common terms

Subtracting fractions is easy when you have common denominators. Explain to students that when the denominators—or the bottom numbers—are the same in two fractions, they only need to subtract the numerators or top numbers. The five worksheets below give students plenty of practice subtracting fractions with common denominators.

Each slide provides two printables. Students work the problems and write down their answers on the first printable in each slide. The second printable in each slide provides the answers to the problems to make grading easy.

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## Worksheet No. 1

In this worksheet, students will subtract fractions with common denominators and reduce them to the smallest terms. For example, in one of the problems, students will answer the problem: 8/9 – 2/9. Since the common denominator is "9," students only need to subtract "2" from "8," which equals "6." They then place the "6" over the common denominator, yielding 6/9.

They then reduce the fraction to its lowest terms, also known as the least common multiples. Since "3" goes into "6" twice and into "9" three times, the fraction reduces to 2/3.

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## Worksheet No. 2

This printable offers students more practice subtracting fractions with common denominators and reducing them to the smallest terms, or least common multiples.

If students are struggling, review the concepts. Explain that the least common denominator and least common multiples are related. The least common multiple is the smallest positive whole number into which two numbers can be divided evenly. The least common denominator is the smallest least common multiple that the bottom number (denominator) of two given fractions share.

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## Worksheet No. 3

Before having students answer the problems on this printable, take the time work a problem or two for students as you demonstrate on the chalkboard or a piece of paper.

For example, take an easy calculation, such as the first problem on this worksheet: 2/4 – 1/4. Explain again that the denominator is the number on the bottom of the fraction, which is "4" in this case. Explain to students that since you have a common denominator, they only need to subtract the second numerator from the first, or "2" minus "1," which equals "1." They then place the answer—called the "difference" in subtraction problems—over the common denominator yielding an answer of "1/4."

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