Math K-Plus

# How To Subtract Fractions, Common Denominators, 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.