Answers

Subtract 40/21 from 8/90

1^st number: 8/90, 2^nd number: 1 19/21

8/90 - 40/21 is -572/315.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 21 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 90 × 7 = 630,
   8/90 = 8 × 7/90 × 7 = 56/630
3. Likewise, for the 2nd fraction, since 21 × 30 = 630,
   40/21 = 40 × 30/21 × 30 = 1200/630
4. Subtract the two like fractions:
   56/630 - 1200/630 = 56 - 1200/630 = -1144/630
5. After reducing the fraction, the answer is -572/315

MathStep (Works offline)

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

Related: ¹⁶/₉₀-⁴⁰/₂₁ ⁸/₉₀-⁸⁰/₂₁ ⁸/₉₀-⁴⁰/₄₂ ²⁴/₉₀-⁴⁰/₂₁ ⁸/₉₀-⁴⁰/₆₃ ⁴⁰/₉₀-⁴⁰/₂₁ ⁵⁶/₉₀-⁴⁰/₂₁

Subtract Fractions Calculator