Answers

Subtract 72/7 from 81/24

1^st number: 3 9/24, 2^nd number: 10 2/7

81/24 - 72/7 is -387/56.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 24 and 7 is 168
   
   Next, find the equivalent fraction of both fractional numbers with denominator 168
2. For the 1st fraction, since 24 × 7 = 168,
   81/24 = 81 × 7/24 × 7 = 567/168
3. Likewise, for the 2nd fraction, since 7 × 24 = 168,
   72/7 = 72 × 24/7 × 24 = 1728/168
4. Subtract the two like fractions:
   567/168 - 1728/168 = 567 - 1728/168 = -1161/168
5. After reducing the fraction, the answer is -387/56

MathStep (Works offline)

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

Related: ⁸¹/₄₈-⁷²/₇ ⁸¹/₂₄-⁷²/₁₄ ⁸¹/₇₂-⁷²/₇ ⁸¹/₂₄-⁷²/₂₁ ⁸¹/₂₄-⁷²/₃₅ ⁸¹/₂₄-⁷²/₄₉

Subtract Fractions Calculator