Subtract 4/84 from 45/18, Solve 2 9/18

Subtract 4/84 from 45/18

1^st number: 2 9/18, 2^nd number: 4/84

45/18 - 4/84 is 103/42.

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,
45/18 = 45 × 14/18 × 14 = 630/252
Likewise, for the 2nd fraction, since 84 × 3 = 252,
4/84 = 4 × 3/84 × 3 = 12/252
Subtract the two like fractions:
630/252 - 12/252 = 630 - 12/252 = 618/252
After reducing the fraction, the answer is 103/42
In mixed form: 219/42

MathStep (Works offline)

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