Answers

Subtract 8/20 from 21/4

1^st number: 5 1/4, 2^nd number: 8/20

21/4 - 8/20 is 97/20.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 4 and 20 is 20
   
   Next, find the equivalent fraction of both fractional numbers with denominator 20
2. For the 1st fraction, since 4 × 5 = 20,
   21/4 = 21 × 5/4 × 5 = 105/20
3. Likewise, for the 2nd fraction, since 20 × 1 = 20,
   8/20 = 8 × 1/20 × 1 = 8/20
4. Subtract the two like fractions:
   105/20 - 8/20 = 105 - 8/20 = 97/20
5. In mixed form: 417/20

MathStep (Works offline)

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

Related: ⁴²/₄-⁸/₂₀ ²¹/₄-¹⁶/₂₀ ²¹/₈-⁸/₂₀ ²¹/₄-⁸/₄₀ ⁶³/₄-⁸/₂₀ ²¹/₄-²⁴/₂₀ ²¹/₁₂-⁸/₂₀ ²¹/₄-⁸/₆₀ ²¹/₄-⁴⁰/₂₀ ²¹/₂₀-⁸/₂₀ ²¹/₄-⁵⁶/₂₀ ²¹/₂₈-⁸/₂₀

Subtract Fractions Calculator