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Math K-Plus

How To Subtract Fractions With Common Denominators And Unlike Denominators

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Learn Fraction Subtraction Math With Common Denominators Or Different Denominators



Subtract Fractions With Common Denominators


79  -  19  = 

The Denominators Of Both Fractions Are The Same - Subtract Numerators (7 - 1)

(7 - 1)9  =  69

Simplify Answer Using Greatest Common Divisor

69  =  6 ÷ 39 ÷ 3  =  23





Subtract Fractions With Different Denominators


74  -  56  = 

We Must Cross-Multiply Both Fractions To Get A Common Denominator

74  =  7 × 64 × 6  =  4224

56  =  5 × 46 × 4  =  2024

The Denominators Of Both Fractions Are Now The Same - Subtract Numerators (42 - 20)

4224  -  2024  =  2224

Simplify Answer Using Greatest Common Divisor

2224  =  22 ÷ 224 ÷ 2  =  1112





Recommended reading: Subtracting Fractions Calculator, How To Add Fractions, How To Multiply Fractions, and How To Divide Fractions.