Answers

Subtract 18/90 from 56/21

1^st number: 2 14/21, 2^nd number: 18/90

56/21 - 18/90 is 37/15.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 90 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 21 × 30 = 630,
   56/21 = 56 × 30/21 × 30 = 1680/630
3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
   18/90 = 18 × 7/90 × 7 = 126/630
4. Subtract the two like fractions:
   1680/630 - 126/630 = 1680 - 126/630 = 1554/630
5. After reducing the fraction, the answer is 37/15
6. In mixed form: 27/15

MathStep (Works offline)

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

Related: ⁵⁶/₂₁-³⁶/₉₀ ⁵⁶/₄₂-¹⁸/₉₀ ⁵⁶/₂₁-⁵⁴/₉₀ ⁵⁶/₆₃-¹⁸/₉₀

Subtract Fractions Calculator