Answers

Subtract 21/45 from 63/21

1^st number: 3 0/21, 2^nd number: 21/45

63/21 - 21/45 is 38/15.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 45 is 315
   
   Next, find the equivalent fraction of both fractional numbers with denominator 315
2. For the 1st fraction, since 21 × 15 = 315,
   63/21 = 63 × 15/21 × 15 = 945/315
3. Likewise, for the 2nd fraction, since 45 × 7 = 315,
   21/45 = 21 × 7/45 × 7 = 147/315
4. Subtract the two like fractions:
   945/315 - 147/315 = 945 - 147/315 = 798/315
5. After reducing the fraction, the answer is 38/15
6. In mixed form: 28/15

MathStep (Works offline)

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

Related: ⁶³/₂₁-⁴²/₄₅ ⁶³/₄₂-²¹/₄₅ ⁶³/₂₁-²¹/₉₀ ⁶³/₂₁-⁶³/₄₅

Subtract Fractions Calculator