Answers

Subtract 15/14 from 21/20

1^st number: 1 1/20, 2^nd number: 1 1/14

21/20 - 15/14 is -3/140.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 14 is 140
   
   Next, find the equivalent fraction of both fractional numbers with denominator 140
2. For the 1st fraction, since 20 × 7 = 140,
   21/20 = 21 × 7/20 × 7 = 147/140
3. Likewise, for the 2nd fraction, since 14 × 10 = 140,
   15/14 = 15 × 10/14 × 10 = 150/140
4. Subtract the two like fractions:
   147/140 - 150/140 = 147 - 150/140 = -3/140

MathStep (Works offline)

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

Related: ⁴²/₂₀-¹⁵/₁₄ ²¹/₂₀-³⁰/₁₄ ²¹/₄₀-¹⁵/₁₄ ²¹/₂₀-¹⁵/₂₈ ⁶³/₂₀-¹⁵/₁₄ ²¹/₂₀-⁴⁵/₁₄ ²¹/₆₀-¹⁵/₁₄ ²¹/₂₀-¹⁵/₄₂ ²¹/₂₀-⁷⁵/₁₄ ²¹/₂₀-¹⁵/₇₀ ²¹/₂₀-¹⁵/₉₈

Subtract Fractions Calculator