Answers

Subtract 25/21 from 20/56

1^st number: 20/56, 2^nd number: 1 4/21

20/56 - 25/21 is -5/6.

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,
   20/56 = 20 × 3/56 × 3 = 60/168
3. Likewise, for the 2nd fraction, since 21 × 8 = 168,
   25/21 = 25 × 8/21 × 8 = 200/168
4. Subtract the two like fractions:
   60/168 - 200/168 = 60 - 200/168 = -140/168
5. After reducing the fraction, the answer is -5/6

MathStep (Works offline)

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

Related: ⁴⁰/₅₆-²⁵/₂₁ ²⁰/₅₆-⁵⁰/₂₁ ²⁰/₅₆-²⁵/₄₂ ⁶⁰/₅₆-²⁵/₂₁ ²⁰/₅₆-⁷⁵/₂₁ ²⁰/₅₆-²⁵/₆₃

Subtract Fractions Calculator