Subtract 21/54 from 28/15
1st number: 1 13/15, 2nd number: 21/54
28/15 - 21/54 is 133/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 54 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 15 × 18 = 270,
28/15 = 28 × 18/15 × 18 = 504/270 - Likewise, for the 2nd fraction, since 54 × 5 = 270,
21/54 = 21 × 5/54 × 5 = 105/270 - Subtract the two like fractions:
504/270 - 105/270 = 504 - 105/270 = 399/270 - After reducing the fraction, the answer is 133/90
- In mixed form: 143/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/15-21/54 28/15-42/54 28/30-21/54 84/15-21/54 28/15-63/54 28/45-21/54 28/75-21/54