Math K-Plus

How To Subtract Fractions, Common Denominators, Different Denominators

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Learn How To Subtract Fractions 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 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.