Answers

Subtract 21/12 from 64/21

1^st number: 3 1/21, 2^nd number: 1 9/12

64/21 - 21/12 is 109/84.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 12 is 84
   
   Next, find the equivalent fraction of both fractional numbers with denominator 84
2. For the 1st fraction, since 21 × 4 = 84,
   64/21 = 64 × 4/21 × 4 = 256/84
3. Likewise, for the 2nd fraction, since 12 × 7 = 84,
   21/12 = 21 × 7/12 × 7 = 147/84
4. Subtract the two like fractions:
   256/84 - 147/84 = 256 - 147/84 = 109/84
5. In mixed form: 125/84

MathStep (Works offline)

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

Related: ⁶⁴/₂₁-⁴²/₁₂ ⁶⁴/₄₂-²¹/₁₂ ⁶⁴/₂₁-²¹/₂₄ ⁶⁴/₂₁-⁶³/₁₂ ⁶⁴/₆₃-²¹/₁₂ ⁶⁴/₂₁-²¹/₃₆ ⁶⁴/₂₁-²¹/₆₀ ⁶⁴/₂₁-²¹/₈₄

Subtract Fractions Calculator