Subtract 24/30 from 81/15, Solve 5 6/15

Subtract 24/30 from 81/15

1^st number: 5 6/15, 2^nd number: 24/30

81/15 - 24/30 is 23/5.

Find the least common denominator or LCM of the two denominators:
LCM of 15 and 30 is 30

Next, find the equivalent fraction of both fractional numbers with denominator 30
For the 1st fraction, since 15 × 2 = 30,
81/15 = 81 × 2/15 × 2 = 162/30
Likewise, for the 2nd fraction, since 30 × 1 = 30,
24/30 = 24 × 1/30 × 1 = 24/30
Subtract the two like fractions:
162/30 - 24/30 = 162 - 24/30 = 138/30
After reducing the fraction, the answer is 23/5
In mixed form: 43/5

MathStep (Works offline)

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