Answers

Subtract 20/21 from 50/56

50/56 - 20/21 is -5/84.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 56 and 21 is 168
   
   Next, find the equivalent fraction of both fractional numbers with denominator 168
2. For the 1st fraction, since 56 × 3 = 168,
   50/56 = 50 × 3/56 × 3 = 150/168
3. Likewise, for the 2nd fraction, since 21 × 8 = 168,
   20/21 = 20 × 8/21 × 8 = 160/168
4. Subtract the two like fractions:
   150/168 - 160/168 = 150 - 160/168 = -10/168
5. After reducing the fraction, the answer is -5/84

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad

Related: ⁵⁰/₅₆-⁴⁰/₂₁ ⁵⁰/₅₆-²⁰/₄₂ ⁵⁰/₅₆-⁶⁰/₂₁ ⁵⁰/₅₆-²⁰/₆₃

Subtract Fractions Calculator