Subtract 21/15 from 15/10
1st number: 1 5/10, 2nd number: 1 6/15
15/10 - 21/15 is 1/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 15 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 10 × 3 = 30,
15/10 = 15 × 3/10 × 3 = 45/30 - Likewise, for the 2nd fraction, since 15 × 2 = 30,
21/15 = 21 × 2/15 × 2 = 42/30 - Subtract the two like fractions:
45/30 - 42/30 = 45 - 42/30 = 3/30 - After reducing the fraction, the answer is 1/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/10-21/15 15/10-42/15 15/20-21/15 15/10-21/30 45/10-21/15 15/10-63/15 15/30-21/15 15/10-21/45 75/10-21/15 15/50-21/15 15/10-21/75 15/70-21/15