Answers

Subtract 70/21 from 98/20

1^st number: 4 18/20, 2^nd number: 3 7/21

98/20 - 70/21 is 47/30.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 21 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 20 × 21 = 420,
   98/20 = 98 × 21/20 × 21 = 2058/420
3. Likewise, for the 2nd fraction, since 21 × 20 = 420,
   70/21 = 70 × 20/21 × 20 = 1400/420
4. Subtract the two like fractions:
   2058/420 - 1400/420 = 2058 - 1400/420 = 658/420
5. After reducing the fraction, the answer is 47/30
6. In mixed form: 117/30

MathStep (Works offline)

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

Related: ⁹⁸/₄₀-⁷⁰/₂₁ ⁹⁸/₂₀-⁷⁰/₄₂ ⁹⁸/₆₀-⁷⁰/₂₁ ⁹⁸/₂₀-⁷⁰/₆₃

Subtract Fractions Calculator