Subtract 21/20 from 6/15
1st number: 6/15, 2nd number: 1 1/20
6/15 - 21/20 is -13/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 20 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 15 × 4 = 60,
6/15 = 6 × 4/15 × 4 = 24/60 - Likewise, for the 2nd fraction, since 20 × 3 = 60,
21/20 = 21 × 3/20 × 3 = 63/60 - Subtract the two like fractions:
24/60 - 63/60 = 24 - 63/60 = -39/60 - After reducing the fraction, the answer is -13/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/15-21/20 6/15-42/20 6/30-21/20 6/15-21/40 18/15-21/20 6/15-63/20 6/45-21/20 6/15-21/60 30/15-21/20 6/75-21/20 42/15-21/20