Subtract 9/84 from 5/80, Solve 5/80

Subtract 9/84 from 5/80

5/80 - 9/84 is -5/112.

Find the least common denominator or LCM of the two denominators:
LCM of 80 and 84 is 1680

Next, find the equivalent fraction of both fractional numbers with denominator 1680
For the 1st fraction, since 80 × 21 = 1680,
5/80 = 5 × 21/80 × 21 = 105/1680
Likewise, for the 2nd fraction, since 84 × 20 = 1680,
9/84 = 9 × 20/84 × 20 = 180/1680
Subtract the two like fractions:
105/1680 - 180/1680 = 105 - 180/1680 = -75/1680
After reducing the fraction, the answer is -5/112

MathStep (Works offline)

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