Answers

Subtract 75/20 from 20/84

1^st number: 20/84, 2^nd number: 3 15/20

20/84 - 75/20 is -295/84.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 20 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 84 × 5 = 420,
   20/84 = 20 × 5/84 × 5 = 100/420
3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
   75/20 = 75 × 21/20 × 21 = 1575/420
4. Subtract the two like fractions:
   100/420 - 1575/420 = 100 - 1575/420 = -1475/420
5. After reducing the fraction, the answer is -295/84

MathStep (Works offline)

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

Related: ⁴⁰/₈₄-⁷⁵/₂₀ ²⁰/₈₄-⁷⁵/₄₀ ⁶⁰/₈₄-⁷⁵/₂₀ ²⁰/₈₄-⁷⁵/₆₀

Subtract Fractions Calculator