Subtract 21/72 from 40/28
1st number: 1 12/28, 2nd number: 21/72
40/28 - 21/72 is 191/168.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 28 × 18 = 504,
40/28 = 40 × 18/28 × 18 = 720/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
21/72 = 21 × 7/72 × 7 = 147/504 - Subtract the two like fractions:
720/504 - 147/504 = 720 - 147/504 = 573/504 - After reducing the fraction, the answer is 191/168
- In mixed form: 123/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/28-21/72 40/28-42/72 40/56-21/72 40/28-63/72 40/84-21/72