Subtract 5/10 from 21/15
1st number: 1 6/15, 2nd number: 5/10
21/15 - 5/10 is 9/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 10 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 15 × 2 = 30,
21/15 = 21 × 2/15 × 2 = 42/30 - Likewise, for the 2nd fraction, since 10 × 3 = 30,
5/10 = 5 × 3/10 × 3 = 15/30 - Subtract the two like fractions:
42/30 - 15/30 = 42 - 15/30 = 27/30 - After reducing the fraction, the answer is 9/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15-5/10 21/30-5/10 21/15-5/20 63/15-5/10 21/15-15/10 21/45-5/10 21/15-5/30 21/15-25/10 21/75-5/10 21/15-5/50 21/15-35/10 21/15-5/70