Answers

Subtract 72/21 from 24/84

1^st number: 24/84, 2^nd number: 3 9/21

24/84 - 72/21 is -22/7.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 21 is 84
   
   Next, find the equivalent fraction of both fractional numbers with denominator 84
2. For the 1st fraction, since 84 × 1 = 84,
   24/84 = 24 × 1/84 × 1 = 24/84
3. Likewise, for the 2nd fraction, since 21 × 4 = 84,
   72/21 = 72 × 4/21 × 4 = 288/84
4. Subtract the two like fractions:
   24/84 - 288/84 = 24 - 288/84 = -264/84
5. After reducing the fraction, the answer is -22/7

MathStep (Works offline)

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

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

Subtract Fractions Calculator