Subtract 21/15 from 3/4
1st number: 3/4, 2nd number: 1 6/15
3/4 - 21/15 is -13/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 15 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 4 × 15 = 60,
3/4 = 3 × 15/4 × 15 = 45/60 - Likewise, for the 2nd fraction, since 15 × 4 = 60,
21/15 = 21 × 4/15 × 4 = 84/60 - Subtract the two like fractions:
45/60 - 84/60 = 45 - 84/60 = -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: 6/4-21/15 3/4-42/15 3/8-21/15 3/4-21/30 9/4-21/15 3/4-63/15 3/12-21/15 3/4-21/45 15/4-21/15 3/20-21/15 3/4-21/75 21/4-21/15 3/28-21/15