Answers

Subtract 81/21 from 20/3

1^st number: 6 2/3, 2^nd number: 3 18/21

20/3 - 81/21 is 59/21.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 3 and 21 is 21
   
   Next, find the equivalent fraction of both fractional numbers with denominator 21
2. For the 1st fraction, since 3 × 7 = 21,
   20/3 = 20 × 7/3 × 7 = 140/21
3. Likewise, for the 2nd fraction, since 21 × 1 = 21,
   81/21 = 81 × 1/21 × 1 = 81/21
4. Subtract the two like fractions:
   140/21 - 81/21 = 140 - 81/21 = 59/21
5. In mixed form: 217/21

MathStep (Works offline)

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

Related: ⁴⁰/₃-⁸¹/₂₁ ²⁰/₆-⁸¹/₂₁ ²⁰/₃-⁸¹/₄₂ ⁶⁰/₃-⁸¹/₂₁ ²⁰/₉-⁸¹/₂₁ ²⁰/₃-⁸¹/₆₃ ²⁰/₁₅-⁸¹/₂₁ ²⁰/₂₁-⁸¹/₂₁

Subtract Fractions Calculator