Answers

Subtract 28/45 from 15/42

15/42 - 28/45 is -167/630.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 45 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 42 × 15 = 630,
   15/42 = 15 × 15/42 × 15 = 225/630
3. Likewise, for the 2nd fraction, since 45 × 14 = 630,
   28/45 = 28 × 14/45 × 14 = 392/630
4. Subtract the two like fractions:
   225/630 - 392/630 = 225 - 392/630 = -167/630

MathStep (Works offline)

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

Related: ³⁰/₄₂-²⁸/₄₅ ¹⁵/₄₂-⁵⁶/₄₅ ¹⁵/₈₄-²⁸/₄₅ ¹⁵/₄₂-²⁸/₉₀ ⁴⁵/₄₂-²⁸/₄₅ ¹⁵/₄₂-⁸⁴/₄₅ ⁷⁵/₄₂-²⁸/₄₅

Subtract Fractions Calculator