Subtract 7/80 from 3/72
3/72 - 7/80 is -11/240.
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,
3/72 = 3 × 10/72 × 10 = 30/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
7/80 = 7 × 9/80 × 9 = 63/720 - Subtract the two like fractions:
30/720 - 63/720 = 30 - 63/720 = -33/720 - After reducing the fraction, the answer is -11/240
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/72-7/80 3/72-14/80 9/72-7/80 3/72-21/80 15/72-7/80 3/72-35/80 21/72-7/80 3/72-49/80