Answers

Subtract 72/80 from 30/36

30/36 - 72/80 is -1/15.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 36 and 80 is 720
   
   Next, find the equivalent fraction of both fractional numbers with denominator 720
2. For the 1st fraction, since 36 × 20 = 720,
   30/36 = 30 × 20/36 × 20 = 600/720
3. Likewise, for the 2nd fraction, since 80 × 9 = 720,
   72/80 = 72 × 9/80 × 9 = 648/720
4. Subtract the two like fractions:
   600/720 - 648/720 = 600 - 648/720 = -48/720
5. After reducing the fraction, the answer is -1/15

MathStep (Works offline)

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

Related: ⁶⁰/₃₆-⁷²/₈₀ ³⁰/₇₂-⁷²/₈₀ ⁹⁰/₃₆-⁷²/₈₀

Subtract Fractions Calculator