Answers

Subtract 21/8 from 21/63

1^st number: 21/63, 2^nd number: 2 5/8

21/63 - 21/8 is -55/24.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 8 is 504
   
   Next, find the equivalent fraction of both fractional numbers with denominator 504
2. For the 1st fraction, since 63 × 8 = 504,
   21/63 = 21 × 8/63 × 8 = 168/504
3. Likewise, for the 2nd fraction, since 8 × 63 = 504,
   21/8 = 21 × 63/8 × 63 = 1323/504
4. Subtract the two like fractions:
   168/504 - 1323/504 = 168 - 1323/504 = -1155/504
5. After reducing the fraction, the answer is -55/24

MathStep (Works offline)

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

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

Subtract Fractions Calculator