Answers

Subtract 75/21 from 7/72

1^st number: 7/72, 2^nd number: 3 12/21

7/72 - 75/21 is -1751/504.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 72 and 21 is 504
   
   Next, find the equivalent fraction of both fractional numbers with denominator 504
2. For the 1st fraction, since 72 × 7 = 504,
   7/72 = 7 × 7/72 × 7 = 49/504
3. Likewise, for the 2nd fraction, since 21 × 24 = 504,
   75/21 = 75 × 24/21 × 24 = 1800/504
4. Subtract the two like fractions:
   49/504 - 1800/504 = 49 - 1800/504 = -1751/504

MathStep (Works offline)

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

Related: ¹⁴/₇₂-⁷⁵/₂₁ ⁷/₇₂-⁷⁵/₄₂ ²¹/₇₂-⁷⁵/₂₁ ⁷/₇₂-⁷⁵/₆₃ ³⁵/₇₂-⁷⁵/₂₁ ⁴⁹/₇₂-⁷⁵/₂₁

Subtract Fractions Calculator