Answers

Subtract 25/20 from 30/70

1^st number: 30/70, 2^nd number: 1 5/20

30/70 - 25/20 is -23/28.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 20 is 140
   
   Next, find the equivalent fraction of both fractional numbers with denominator 140
2. For the 1st fraction, since 70 × 2 = 140,
   30/70 = 30 × 2/70 × 2 = 60/140
3. Likewise, for the 2nd fraction, since 20 × 7 = 140,
   25/20 = 25 × 7/20 × 7 = 175/140
4. Subtract the two like fractions:
   60/140 - 175/140 = 60 - 175/140 = -115/140
5. After reducing the fraction, the answer is -23/28

MathStep (Works offline)

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

Related: ⁶⁰/₇₀-²⁵/₂₀ ³⁰/₇₀-⁵⁰/₂₀ ³⁰/₇₀-²⁵/₄₀ ⁹⁰/₇₀-²⁵/₂₀ ³⁰/₇₀-⁷⁵/₂₀ ³⁰/₇₀-²⁵/₆₀

Subtract Fractions Calculator