Subtract 16/21 from 80/15, Solve 5 5/15

Subtract 16/21 from 80/15

1^st number: 5 5/15, 2^nd number: 16/21

80/15 - 16/21 is 32/7.

Find the least common denominator or LCM of the two denominators:
LCM of 15 and 21 is 105

Next, find the equivalent fraction of both fractional numbers with denominator 105
For the 1st fraction, since 15 × 7 = 105,
80/15 = 80 × 7/15 × 7 = 560/105
Likewise, for the 2nd fraction, since 21 × 5 = 105,
16/21 = 16 × 5/21 × 5 = 80/105
Subtract the two like fractions:
560/105 - 80/105 = 560 - 80/105 = 480/105
After reducing the fraction, the answer is 32/7
In mixed form: 44/7

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad