Subtract 40/84 from 21/15
1st number: 1 6/15, 2nd number: 40/84
21/15 - 40/84 is 97/105.
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,
40/84 = 40 × 5/84 × 5 = 200/420 - Subtract the two like fractions:
588/420 - 200/420 = 588 - 200/420 = 388/420 - After reducing the fraction, the answer is 97/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15-40/84 21/15-80/84 21/30-40/84 63/15-40/84 21/45-40/84 21/75-40/84