Answers

Subtract 63/8 from 21/64

1^st number: 21/64, 2^nd number: 7 7/8

21/64 - 63/8 is -483/64.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 64 and 8 is 64
   
   Next, find the equivalent fraction of both fractional numbers with denominator 64
2. For the 1st fraction, since 64 × 1 = 64,
   21/64 = 21 × 1/64 × 1 = 21/64
3. Likewise, for the 2nd fraction, since 8 × 8 = 64,
   63/8 = 63 × 8/8 × 8 = 504/64
4. Subtract the two like fractions:
   21/64 - 504/64 = 21 - 504/64 = -483/64

MathStep (Works offline)

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

Related: ⁴²/₆₄-⁶³/₈ ²¹/₆₄-⁶³/₁₆ ⁶³/₆₄-⁶³/₈ ²¹/₆₄-⁶³/₂₄ ²¹/₆₄-⁶³/₄₀ ²¹/₆₄-⁶³/₅₆

Subtract Fractions Calculator