Answers

Subtract 8/70 from 81/28

1^st number: 2 25/28, 2^nd number: 8/70

81/28 - 8/70 is 389/140.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 28 and 70 is 140
   
   Next, find the equivalent fraction of both fractional numbers with denominator 140
2. For the 1st fraction, since 28 × 5 = 140,
   81/28 = 81 × 5/28 × 5 = 405/140
3. Likewise, for the 2nd fraction, since 70 × 2 = 140,
   8/70 = 8 × 2/70 × 2 = 16/140
4. Subtract the two like fractions:
   405/140 - 16/140 = 405 - 16/140 = 389/140
5. In mixed form: 2109/140

MathStep (Works offline)

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

Related: ⁸¹/₂₈-¹⁶/₇₀ ⁸¹/₅₆-⁸/₇₀ ⁸¹/₂₈-²⁴/₇₀ ⁸¹/₈₄-⁸/₇₀ ⁸¹/₂₈-⁴⁰/₇₀ ⁸¹/₂₈-⁵⁶/₇₀

Subtract Fractions Calculator