Answers

Subtract 8/9 from 40/21

1^st number: 1 19/21, 2^nd number: 8/9

40/21 - 8/9 is 64/63.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 9 is 63
   
   Next, find the equivalent fraction of both fractional numbers with denominator 63
2. For the 1st fraction, since 21 × 3 = 63,
   40/21 = 40 × 3/21 × 3 = 120/63
3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
   8/9 = 8 × 7/9 × 7 = 56/63
4. Subtract the two like fractions:
   120/63 - 56/63 = 120 - 56/63 = 64/63
5. In mixed form: 11/63

MathStep (Works offline)

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

Related: ⁸⁰/₂₁-⁸/₉ ⁴⁰/₂₁-¹⁶/₉ ⁴⁰/₄₂-⁸/₉ ⁴⁰/₂₁-⁸/₁₈ ⁴⁰/₂₁-²⁴/₉ ⁴⁰/₆₃-⁸/₉ ⁴⁰/₂₁-⁸/₂₇ ⁴⁰/₂₁-⁴⁰/₉ ⁴⁰/₂₁-⁸/₄₅ ⁴⁰/₂₁-⁵⁶/₉ ⁴⁰/₂₁-⁸/₆₃

Subtract Fractions Calculator