Subtract 21/45 from 28/15
1st number: 1 13/15, 2nd number: 21/45
28/15 - 21/45 is 7/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 45 is 45
Next, find the equivalent fraction of both fractional numbers with denominator 45 - For the 1st fraction, since 15 × 3 = 45,
28/15 = 28 × 3/15 × 3 = 84/45 - Likewise, for the 2nd fraction, since 45 × 1 = 45,
21/45 = 21 × 1/45 × 1 = 21/45 - Subtract the two like fractions:
84/45 - 21/45 = 84 - 21/45 = 63/45 - After reducing the fraction, the answer is 7/5
- In mixed form: 12/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/15-21/45 28/15-42/45 28/30-21/45 28/15-21/90 84/15-21/45 28/15-63/45 28/45-21/45 28/75-21/45