Subtract Fractions with Unlike Denominators

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What do you need to find when adding or subtracting fractions with unlike denominators?

Back

You need to find the least common multiple (LCM) to change your denominator.

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CCSS.7.NS.A.1C

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When do you simplify fractions?

Back

You simplify all the time unless the fraction is already simplified.

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Back

Find the least common multiple of the denominators (3 and 8), which is 24.

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CCSS.5.NF.A.1

CCSS.5.NF.A.2

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CCSS.3.NF.A.3B

CCSS.4.NF.A.1

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CCSS.3.NF.A.3B

CCSS.4.NF.A.1

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CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

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What is the least common multiple of 5 and 2?

Back

The least common multiple (LCM) of 5 and 2 is 10.

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Back

Find the least common multiple of the denominators (5 and 2), which is 10.

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CCSS.5.NF.A.1

CCSS.5.NF.A.2

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CCSS.3.NF.A.3B

CCSS.4.NF.A.1

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CCSS.3.NF.A.3B

CCSS.4.NF.A.1