Subtract 21/72 from 30/28
1st number: 1 2/28, 2nd number: 21/72
30/28 - 21/72 is 131/168.
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,
30/28 = 30 × 18/28 × 18 = 540/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
21/72 = 21 × 7/72 × 7 = 147/504 - Subtract the two like fractions:
540/504 - 147/504 = 540 - 147/504 = 393/504 - After reducing the fraction, the answer is 131/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/28-21/72 30/28-42/72 30/56-21/72 90/28-21/72 30/28-63/72 30/84-21/72