Subtract 45/12 from 84/15, Solve 5 9/15

Subtract 45/12 from 84/15

1^st number: 5 9/15, 2^nd number: 3 9/12

84/15 - 45/12 is 37/20.

Find the least common denominator or LCM of the two denominators:
LCM of 15 and 12 is 60

Next, find the equivalent fraction of both fractional numbers with denominator 60
For the 1st fraction, since 15 × 4 = 60,
84/15 = 84 × 4/15 × 4 = 336/60
Likewise, for the 2nd fraction, since 12 × 5 = 60,
45/12 = 45 × 5/12 × 5 = 225/60
Subtract the two like fractions:
336/60 - 225/60 = 336 - 225/60 = 111/60
After reducing the fraction, the answer is 37/20
In mixed form: 117/20

MathStep (Works offline)

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