Answers

Subtract 1/21 from 81/8

1^st number: 10 1/8, 2^nd number: 1/21

81/8 - 1/21 is 1693/168.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 8 and 21 is 168
   
   Next, find the equivalent fraction of both fractional numbers with denominator 168
2. For the 1st fraction, since 8 × 21 = 168,
   81/8 = 81 × 21/8 × 21 = 1701/168
3. Likewise, for the 2nd fraction, since 21 × 8 = 168,
   1/21 = 1 × 8/21 × 8 = 8/168
4. Subtract the two like fractions:
   1701/168 - 8/168 = 1701 - 8/168 = 1693/168
5. In mixed form: 1013/168

MathStep (Works offline)

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

Related: ⁸¹/₈-²/₂₁ ⁸¹/₁₆-¹/₂₁ ⁸¹/₈-¹/₄₂ ⁸¹/₈-³/₂₁ ⁸¹/₂₄-¹/₂₁ ⁸¹/₈-¹/₆₃ ⁸¹/₈-⁵/₂₁ ⁸¹/₄₀-¹/₂₁ ⁸¹/₈-⁷/₂₁ ⁸¹/₅₆-¹/₂₁

Subtract Fractions Calculator