Answers

Subtract 63/4 from 21/28

1^st number: 21/28, 2^nd number: 15 3/4

21/28 - 63/4 is -15/1.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 28 and 4 is 28
   
   Next, find the equivalent fraction of both fractional numbers with denominator 28
2. For the 1st fraction, since 28 × 1 = 28,
   21/28 = 21 × 1/28 × 1 = 21/28
3. Likewise, for the 2nd fraction, since 4 × 7 = 28,
   63/4 = 63 × 7/4 × 7 = 441/28
4. Subtract the two like fractions:
   21/28 - 441/28 = 21 - 441/28 = -420/28
5. After reducing the fraction, the answer is -15/1

MathStep (Works offline)

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

Related: ⁴²/₂₈-⁶³/₄ ²¹/₅₆-⁶³/₄ ²¹/₂₈-⁶³/₈ ⁶³/₂₈-⁶³/₄ ²¹/₈₄-⁶³/₄ ²¹/₂₈-⁶³/₁₂ ²¹/₂₈-⁶³/₂₀ ²¹/₂₈-⁶³/₂₈

Subtract Fractions Calculator