Answers

Subtract 72/70 from 15/80

1^st number: 15/80, 2^nd number: 1 2/70

15/80 - 72/70 is -471/560.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 70 is 560
   
   Next, find the equivalent fraction of both fractional numbers with denominator 560
2. For the 1st fraction, since 80 × 7 = 560,
   15/80 = 15 × 7/80 × 7 = 105/560
3. Likewise, for the 2nd fraction, since 70 × 8 = 560,
   72/70 = 72 × 8/70 × 8 = 576/560
4. Subtract the two like fractions:
   105/560 - 576/560 = 105 - 576/560 = -471/560

MathStep (Works offline)

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

Related: ³⁰/₈₀-⁷²/₇₀ ⁴⁵/₈₀-⁷²/₇₀ ⁷⁵/₈₀-⁷²/₇₀

Subtract Fractions Calculator