Subtract 5/45 from 7/84, Solve 7/84

Subtract 5/45 from 7/84

7/84 - 5/45 is -1/36.

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

Next, find the equivalent fraction of both fractional numbers with denominator 1260
For the 1st fraction, since 84 × 15 = 1260,
7/84 = 7 × 15/84 × 15 = 105/1260
Likewise, for the 2nd fraction, since 45 × 28 = 1260,
5/45 = 5 × 28/45 × 28 = 140/1260
Subtract the two like fractions:
105/1260 - 140/1260 = 105 - 140/1260 = -35/1260
After reducing the fraction, the answer is -1/36

MathStep (Works offline)

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