Answers

Subtract 42/90 from 20/15

1^st number: 1 5/15, 2^nd number: 42/90

20/15 - 42/90 is 13/15.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 15 and 90 is 90
   
   Next, find the equivalent fraction of both fractional numbers with denominator 90
2. For the 1st fraction, since 15 × 6 = 90,
   20/15 = 20 × 6/15 × 6 = 120/90
3. Likewise, for the 2nd fraction, since 90 × 1 = 90,
   42/90 = 42 × 1/90 × 1 = 42/90
4. Subtract the two like fractions:
   120/90 - 42/90 = 120 - 42/90 = 78/90
5. After reducing the fraction, the answer is 13/15

MathStep (Works offline)

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

Related: ⁴⁰/₁₅-⁴²/₉₀ ²⁰/₁₅-⁸⁴/₉₀ ²⁰/₃₀-⁴²/₉₀ ⁶⁰/₁₅-⁴²/₉₀ ²⁰/₄₅-⁴²/₉₀ ²⁰/₇₅-⁴²/₉₀

Subtract Fractions Calculator