Subtract 28/80 from 8/72
8/72 - 28/80 is -43/180.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 72 × 10 = 720,
8/72 = 8 × 10/72 × 10 = 80/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
28/80 = 28 × 9/80 × 9 = 252/720 - Subtract the two like fractions:
80/720 - 252/720 = 80 - 252/720 = -172/720 - After reducing the fraction, the answer is -43/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/72-28/80 8/72-56/80 24/72-28/80 8/72-84/80 40/72-28/80 56/72-28/80