Answers

Subtract 24/21 from 24/42

1^st number: 24/42, 2^nd number: 1 3/21

24/42 - 24/21 is -4/7.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 21 is 42
   
   Next, find the equivalent fraction of both fractional numbers with denominator 42
2. For the 1st fraction, since 42 × 1 = 42,
   24/42 = 24 × 1/42 × 1 = 24/42
3. Likewise, for the 2nd fraction, since 21 × 2 = 42,
   24/21 = 24 × 2/21 × 2 = 48/42
4. Subtract the two like fractions:
   24/42 - 48/42 = 24 - 48/42 = -24/42
5. After reducing the fraction, the answer is -4/7

MathStep (Works offline)

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

Related: ⁴⁸/₄₂-²⁴/₂₁ ²⁴/₄₂-⁴⁸/₂₁ ²⁴/₈₄-²⁴/₂₁ ²⁴/₄₂-²⁴/₄₂ ⁷²/₄₂-²⁴/₂₁ ²⁴/₄₂-⁷²/₂₁ ²⁴/₄₂-²⁴/₆₃

Subtract Fractions Calculator