Answers

Subtract 63/21 from 63/8

1^st number: 7 7/8, 2^nd number: 3 0/21

63/8 - 63/21 is 39/8.

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,
   63/8 = 63 × 21/8 × 21 = 1323/168
3. Likewise, for the 2nd fraction, since 21 × 8 = 168,
   63/21 = 63 × 8/21 × 8 = 504/168
4. Subtract the two like fractions:
   1323/168 - 504/168 = 1323 - 504/168 = 819/168
5. After reducing the fraction, the answer is 39/8
6. In mixed form: 47/8

MathStep (Works offline)

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

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

Subtract Fractions Calculator