Subtract 21/84 from 21/15
1st number: 1 6/15, 2nd number: 21/84
21/15 - 21/84 is 23/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 84 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 15 × 28 = 420,
21/15 = 21 × 28/15 × 28 = 588/420 - Likewise, for the 2nd fraction, since 84 × 5 = 420,
21/84 = 21 × 5/84 × 5 = 105/420 - Subtract the two like fractions:
588/420 - 105/420 = 588 - 105/420 = 483/420 - After reducing the fraction, the answer is 23/20
- In mixed form: 13/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15-21/84 21/15-42/84 21/30-21/84 63/15-21/84 21/15-63/84 21/45-21/84 21/75-21/84