Subtract 7/84 from 90/18, Solve 5 0/18

Subtract 7/84 from 90/18

1^st number: 5 0/18, 2^nd number: 7/84

90/18 - 7/84 is 59/12.

Find the least common denominator or LCM of the two denominators:
LCM of 18 and 84 is 252

Next, find the equivalent fraction of both fractional numbers with denominator 252
For the 1st fraction, since 18 × 14 = 252,
90/18 = 90 × 14/18 × 14 = 1260/252
Likewise, for the 2nd fraction, since 84 × 3 = 252,
7/84 = 7 × 3/84 × 3 = 21/252
Subtract the two like fractions:
1260/252 - 21/252 = 1260 - 21/252 = 1239/252
After reducing the fraction, the answer is 59/12
In mixed form: 411/12

MathStep (Works offline)

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