Subtract 40/5 from 15/84, Solve 15/84

Subtract 40/5 from 15/84

1^st number: 15/84, 2^nd number: 8 0/5

15/84 - 40/5 is -219/28.

Find the least common denominator or LCM of the two denominators:
LCM of 84 and 5 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 84 × 5 = 420,
15/84 = 15 × 5/84 × 5 = 75/420
Likewise, for the 2nd fraction, since 5 × 84 = 420,
40/5 = 40 × 84/5 × 84 = 3360/420
Subtract the two like fractions:
75/420 - 3360/420 = 75 - 3360/420 = -3285/420
After reducing the fraction, the answer is -219/28

MathStep (Works offline)

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