Answers

Subtract 5/21 from 9/4

1^st number: 2 1/4, 2^nd number: 5/21

9/4 - 5/21 is 169/84.

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,
   9/4 = 9 × 21/4 × 21 = 189/84
3. Likewise, for the 2nd fraction, since 21 × 4 = 84,
   5/21 = 5 × 4/21 × 4 = 20/84
4. Subtract the two like fractions:
   189/84 - 20/84 = 189 - 20/84 = 169/84
5. In mixed form: 21/84

MathStep (Works offline)

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

Related: ¹⁸/₄-⁵/₂₁ ⁹/₄-¹⁰/₂₁ ⁹/₈-⁵/₂₁ ⁹/₄-⁵/₄₂ ²⁷/₄-⁵/₂₁ ⁹/₄-¹⁵/₂₁ ⁹/₁₂-⁵/₂₁ ⁹/₄-⁵/₆₃ ⁴⁵/₄-⁵/₂₁ ⁹/₄-²⁵/₂₁ ⁹/₂₀-⁵/₂₁ ⁶³/₄-⁵/₂₁ ⁹/₄-³⁵/₂₁ ⁹/₂₈-⁵/₂₁

Subtract Fractions Calculator