Subtract 21/60 from 20/72
20/72 - 21/60 is -13/180.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 60 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 72 × 5 = 360,
20/72 = 20 × 5/72 × 5 = 100/360 - Likewise, for the 2nd fraction, since 60 × 6 = 360,
21/60 = 21 × 6/60 × 6 = 126/360 - Subtract the two like fractions:
100/360 - 126/360 = 100 - 126/360 = -26/360 - After reducing the fraction, the answer is -13/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/72-21/60 20/72-42/60 60/72-21/60 20/72-63/60