Answers

Subtract 63/21 from 45/4

1^st number: 11 1/4, 2^nd number: 3 0/21

45/4 - 63/21 is 33/4.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 4 and 21 is 84
   
   Next, find the equivalent fraction of both fractional numbers with denominator 84
2. For the 1st fraction, since 4 × 21 = 84,
   45/4 = 45 × 21/4 × 21 = 945/84
3. Likewise, for the 2nd fraction, since 21 × 4 = 84,
   63/21 = 63 × 4/21 × 4 = 252/84
4. Subtract the two like fractions:
   945/84 - 252/84 = 945 - 252/84 = 693/84
5. After reducing the fraction, the answer is 33/4
6. In mixed form: 81/4

MathStep (Works offline)

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

Related: ⁹⁰/₄-⁶³/₂₁ ⁴⁵/₈-⁶³/₂₁ ⁴⁵/₄-⁶³/₄₂ ⁴⁵/₁₂-⁶³/₂₁ ⁴⁵/₂₀-⁶³/₂₁ ⁴⁵/₂₈-⁶³/₂₁

Subtract Fractions Calculator