Subtract 18/32 from 70/80, Solve 70/80

Subtract 18/32 from 70/80

70/80 - 18/32 is 5/16.

Find the least common denominator or LCM of the two denominators:
LCM of 80 and 32 is 160

Next, find the equivalent fraction of both fractional numbers with denominator 160
For the 1st fraction, since 80 × 2 = 160,
70/80 = 70 × 2/80 × 2 = 140/160
Likewise, for the 2nd fraction, since 32 × 5 = 160,
18/32 = 18 × 5/32 × 5 = 90/160
Subtract the two like fractions:
140/160 - 90/160 = 140 - 90/160 = 50/160
After reducing the fraction, the answer is 5/16

MathStep (Works offline)

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