Answers

Subtract 21/8 from 21/56

1^st number: 21/56, 2^nd number: 2 5/8

21/56 - 21/8 is -9/4.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 56 and 8 is 56
   
   Next, find the equivalent fraction of both fractional numbers with denominator 56
2. For the 1st fraction, since 56 × 1 = 56,
   21/56 = 21 × 1/56 × 1 = 21/56
3. Likewise, for the 2nd fraction, since 8 × 7 = 56,
   21/8 = 21 × 7/8 × 7 = 147/56
4. Subtract the two like fractions:
   21/56 - 147/56 = 21 - 147/56 = -126/56
5. After reducing the fraction, the answer is -9/4

MathStep (Works offline)

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

Related: ⁴²/₅₆-²¹/₈ ²¹/₅₆-⁴²/₈ ²¹/₅₆-²¹/₁₆ ⁶³/₅₆-²¹/₈ ²¹/₅₆-⁶³/₈ ²¹/₅₆-²¹/₂₄ ²¹/₅₆-²¹/₄₀ ²¹/₅₆-²¹/₅₆

Subtract Fractions Calculator