Answers

Subtract 35/49 from 42/21

1^st number: 2 0/21, 2^nd number: 35/49

42/21 - 35/49 is 9/7.

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,
   42/21 = 42 × 7/21 × 7 = 294/147
3. Likewise, for the 2nd fraction, since 49 × 3 = 147,
   35/49 = 35 × 3/49 × 3 = 105/147
4. Subtract the two like fractions:
   294/147 - 105/147 = 294 - 105/147 = 189/147
5. After reducing the fraction, the answer is 9/7
6. In mixed form: 12/7

MathStep (Works offline)

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

Related: ⁸⁴/₂₁-³⁵/₄₉ ⁴²/₂₁-⁷⁰/₄₉ ⁴²/₂₁-³⁵/₉₈ ⁴²/₆₃-³⁵/₄₉

Subtract Fractions Calculator