Subtract 15/90 from 72/28
1st number: 2 16/28, 2nd number: 15/90
72/28 - 15/90 is 101/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 90 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 28 × 45 = 1260,
72/28 = 72 × 45/28 × 45 = 3240/1260 - Likewise, for the 2nd fraction, since 90 × 14 = 1260,
15/90 = 15 × 14/90 × 14 = 210/1260 - Subtract the two like fractions:
3240/1260 - 210/1260 = 3240 - 210/1260 = 3030/1260 - After reducing the fraction, the answer is 101/42
- In mixed form: 217/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/28-30/90 72/56-15/90 72/28-45/90 72/84-15/90 72/28-75/90