Subtract 15/54 from 21/8
1st number: 2 5/8, 2nd number: 15/54
21/8 - 15/54 is 169/72.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 54 is 216
Next, find the equivalent fraction of both fractional numbers with denominator 216 - For the 1st fraction, since 8 × 27 = 216,
21/8 = 21 × 27/8 × 27 = 567/216 - Likewise, for the 2nd fraction, since 54 × 4 = 216,
15/54 = 15 × 4/54 × 4 = 60/216 - Subtract the two like fractions:
567/216 - 60/216 = 567 - 60/216 = 507/216 - After reducing the fraction, the answer is 169/72
- In mixed form: 225/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/8-15/54 21/8-30/54 21/16-15/54 63/8-15/54 21/8-45/54 21/24-15/54 21/8-75/54 21/40-15/54 21/56-15/54