Answers

Subtract 21/8 from 70/9

1^st number: 7 7/9, 2^nd number: 2 5/8

70/9 - 21/8 is 371/72.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 9 and 8 is 72
   
   Next, find the equivalent fraction of both fractional numbers with denominator 72
2. For the 1st fraction, since 9 × 8 = 72,
   70/9 = 70 × 8/9 × 8 = 560/72
3. Likewise, for the 2nd fraction, since 8 × 9 = 72,
   21/8 = 21 × 9/8 × 9 = 189/72
4. Subtract the two like fractions:
   560/72 - 189/72 = 560 - 189/72 = 371/72
5. In mixed form: 511/72

MathStep (Works offline)

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

Related: ⁷⁰/₉-⁴²/₈ ⁷⁰/₁₈-²¹/₈ ⁷⁰/₉-²¹/₁₆ ⁷⁰/₉-⁶³/₈ ⁷⁰/₂₇-²¹/₈ ⁷⁰/₉-²¹/₂₄ ⁷⁰/₄₅-²¹/₈ ⁷⁰/₉-²¹/₄₀ ⁷⁰/₆₃-²¹/₈ ⁷⁰/₉-²¹/₅₆

Subtract Fractions Calculator