Answers

Subtract 35/72 from 15/42

15/42 - 35/72 is -65/504.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 72 is 504
   
   Next, find the equivalent fraction of both fractional numbers with denominator 504
2. For the 1st fraction, since 42 × 12 = 504,
   15/42 = 15 × 12/42 × 12 = 180/504
3. Likewise, for the 2nd fraction, since 72 × 7 = 504,
   35/72 = 35 × 7/72 × 7 = 245/504
4. Subtract the two like fractions:
   180/504 - 245/504 = 180 - 245/504 = -65/504

MathStep (Works offline)

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

Related: ³⁰/₄₂-³⁵/₇₂ ¹⁵/₄₂-⁷⁰/₇₂ ¹⁵/₈₄-³⁵/₇₂ ⁴⁵/₄₂-³⁵/₇₂ ⁷⁵/₄₂-³⁵/₇₂

Subtract Fractions Calculator