Answers

Subtract 50/21 from 90/30

1^st number: 3 0/30, 2^nd number: 2 8/21

90/30 - 50/21 is 13/21.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 30 and 21 is 210
   
   Next, find the equivalent fraction of both fractional numbers with denominator 210
2. For the 1st fraction, since 30 × 7 = 210,
   90/30 = 90 × 7/30 × 7 = 630/210
3. Likewise, for the 2nd fraction, since 21 × 10 = 210,
   50/21 = 50 × 10/21 × 10 = 500/210
4. Subtract the two like fractions:
   630/210 - 500/210 = 630 - 500/210 = 130/210
5. After reducing the fraction, the answer is 13/21

MathStep (Works offline)

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

Related: ⁹⁰/₆₀-⁵⁰/₂₁ ⁹⁰/₃₀-⁵⁰/₄₂ ⁹⁰/₃₀-⁵⁰/₆₃

Subtract Fractions Calculator