Subtract 90/24 from 6/84, Solve 6/84

Subtract 90/24 from 6/84

1^st number: 6/84, 2^nd number: 3 18/24

6/84 - 90/24 is -103/28.

Find the least common denominator or LCM of the two denominators:
LCM of 84 and 24 is 168

Next, find the equivalent fraction of both fractional numbers with denominator 168
For the 1st fraction, since 84 × 2 = 168,
6/84 = 6 × 2/84 × 2 = 12/168
Likewise, for the 2nd fraction, since 24 × 7 = 168,
90/24 = 90 × 7/24 × 7 = 630/168
Subtract the two like fractions:
12/168 - 630/168 = 12 - 630/168 = -618/168
After reducing the fraction, the answer is -103/28

MathStep (Works offline)

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