Subtract 18/84 from 5/45, Solve 5/45

Subtract 18/84 from 5/45

5/45 - 18/84 is -13/126.

Find the least common denominator or LCM of the two denominators:
LCM of 45 and 84 is 1260

Next, find the equivalent fraction of both fractional numbers with denominator 1260
For the 1st fraction, since 45 × 28 = 1260,
5/45 = 5 × 28/45 × 28 = 140/1260
Likewise, for the 2nd fraction, since 84 × 15 = 1260,
18/84 = 18 × 15/84 × 15 = 270/1260
Subtract the two like fractions:
140/1260 - 270/1260 = 140 - 270/1260 = -130/1260
After reducing the fraction, the answer is -13/126

MathStep (Works offline)

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