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Math K-Plus

Fractions - Learn How To Subtract Fractions With Common Denominators Or 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.