Subtract 18/70 from 27/80, Solve 27/80

Subtract 18/70 from 27/80

27/80 - 18/70 is 9/112.

Find the least common denominator or LCM of the two denominators:
LCM of 80 and 70 is 560

Next, find the equivalent fraction of both fractional numbers with denominator 560
For the 1st fraction, since 80 × 7 = 560,
27/80 = 27 × 7/80 × 7 = 189/560
Likewise, for the 2nd fraction, since 70 × 8 = 560,
18/70 = 18 × 8/70 × 8 = 144/560
Subtract the two like fractions:
189/560 - 144/560 = 189 - 144/560 = 45/560
After reducing the fraction, the answer is 9/112

MathStep (Works offline)

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