Answers

Subtract 40/49 from 90/21

1^st number: 4 6/21, 2^nd number: 40/49

90/21 - 40/49 is 170/49.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 49 is 147
   
   Next, find the equivalent fraction of both fractional numbers with denominator 147
2. For the 1st fraction, since 21 × 7 = 147,
   90/21 = 90 × 7/21 × 7 = 630/147
3. Likewise, for the 2nd fraction, since 49 × 3 = 147,
   40/49 = 40 × 3/49 × 3 = 120/147
4. Subtract the two like fractions:
   630/147 - 120/147 = 630 - 120/147 = 510/147
5. After reducing the fraction, the answer is 170/49
6. In mixed form: 323/49

MathStep (Works offline)

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

Related: ⁹⁰/₂₁-⁸⁰/₄₉ ⁹⁰/₄₂-⁴⁰/₄₉ ⁹⁰/₂₁-⁴⁰/₉₈ ⁹⁰/₆₃-⁴⁰/₄₉

Subtract Fractions Calculator