Subtract 21/5 from 45/15
1st number: 3 0/15, 2nd number: 4 1/5
45/15 - 21/5 is -6/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 5 is 15
Next, find the equivalent fraction of both fractional numbers with denominator 15 - For the 1st fraction, since 15 × 1 = 15,
45/15 = 45 × 1/15 × 1 = 45/15 - Likewise, for the 2nd fraction, since 5 × 3 = 15,
21/5 = 21 × 3/5 × 3 = 63/15 - Subtract the two like fractions:
45/15 - 63/15 = 45 - 63/15 = -18/15 - After reducing the fraction, the answer is -6/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/15-21/5 45/15-42/5 45/30-21/5 45/15-21/10 45/15-63/5 45/15-21/15 45/75-21/5 45/15-21/25 45/15-21/35