Answers

Subtract 20/27 from 70/21

1^st number: 3 7/21, 2^nd number: 20/27

70/21 - 20/27 is 70/27.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 27 is 189
   
   Next, find the equivalent fraction of both fractional numbers with denominator 189
2. For the 1st fraction, since 21 × 9 = 189,
   70/21 = 70 × 9/21 × 9 = 630/189
3. Likewise, for the 2nd fraction, since 27 × 7 = 189,
   20/27 = 20 × 7/27 × 7 = 140/189
4. Subtract the two like fractions:
   630/189 - 140/189 = 630 - 140/189 = 490/189
5. After reducing the fraction, the answer is 70/27
6. In mixed form: 216/27

MathStep (Works offline)

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

Related: ⁷⁰/₂₁-⁴⁰/₂₇ ⁷⁰/₄₂-²⁰/₂₇ ⁷⁰/₂₁-²⁰/₅₄ ⁷⁰/₂₁-⁶⁰/₂₇ ⁷⁰/₆₃-²⁰/₂₇ ⁷⁰/₂₁-²⁰/₈₁

Subtract Fractions Calculator