Subtract 21/56 from 45/15
1st number: 3 0/15, 2nd number: 21/56
45/15 - 21/56 is 21/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 56 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 15 × 56 = 840,
45/15 = 45 × 56/15 × 56 = 2520/840 - Likewise, for the 2nd fraction, since 56 × 15 = 840,
21/56 = 21 × 15/56 × 15 = 315/840 - Subtract the two like fractions:
2520/840 - 315/840 = 2520 - 315/840 = 2205/840 - After reducing the fraction, the answer is 21/8
- In mixed form: 25/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/15-21/56 45/15-42/56 45/30-21/56 45/15-63/56 45/75-21/56