Subtract 72/15 from 30/28
1st number: 1 2/28, 2nd number: 4 12/15
30/28 - 72/15 is -261/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 15 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 28 × 15 = 420,
30/28 = 30 × 15/28 × 15 = 450/420 - Likewise, for the 2nd fraction, since 15 × 28 = 420,
72/15 = 72 × 28/15 × 28 = 2016/420 - Subtract the two like fractions:
450/420 - 2016/420 = 450 - 2016/420 = -1566/420 - After reducing the fraction, the answer is -261/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/28-72/15 30/56-72/15 30/28-72/30 90/28-72/15 30/84-72/15 30/28-72/45 30/28-72/75