Subtract 21/16 from 10/72
1st number: 10/72, 2nd number: 1 5/16
10/72 - 21/16 is -169/144.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 16 is 144
Next, find the equivalent fraction of both fractional numbers with denominator 144 - For the 1st fraction, since 72 × 2 = 144,
10/72 = 10 × 2/72 × 2 = 20/144 - Likewise, for the 2nd fraction, since 16 × 9 = 144,
21/16 = 21 × 9/16 × 9 = 189/144 - Subtract the two like fractions:
20/144 - 189/144 = 20 - 189/144 = -169/144
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/72-21/16 10/72-42/16 10/72-21/32 30/72-21/16 10/72-63/16 10/72-21/48 50/72-21/16 10/72-21/80 70/72-21/16