Answers

Subtract 63/90 from 10/42

10/42 - 63/90 is -97/210.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 90 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 42 × 15 = 630,
   10/42 = 10 × 15/42 × 15 = 150/630
3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
   63/90 = 63 × 7/90 × 7 = 441/630
4. Subtract the two like fractions:
   150/630 - 441/630 = 150 - 441/630 = -291/630
5. After reducing the fraction, the answer is -97/210

MathStep (Works offline)

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

Related: ²⁰/₄₂-⁶³/₉₀ ¹⁰/₈₄-⁶³/₉₀ ³⁰/₄₂-⁶³/₉₀ ⁵⁰/₄₂-⁶³/₉₀ ⁷⁰/₄₂-⁶³/₉₀

Subtract Fractions Calculator