Subtract 80/84 from 35/15, Solve 2 5/15

Subtract 80/84 from 35/15

1^st number: 2 5/15, 2^nd number: 80/84

35/15 - 80/84 is 29/21.

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,
35/15 = 35 × 28/15 × 28 = 980/420
Likewise, for the 2nd fraction, since 84 × 5 = 420,
80/84 = 80 × 5/84 × 5 = 400/420
Subtract the two like fractions:
980/420 - 400/420 = 980 - 400/420 = 580/420
After reducing the fraction, the answer is 29/21
In mixed form: 18/21

MathStep (Works offline)

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