Subtract 20/7 from 5/80, Solve 5/80

Subtract 20/7 from 5/80

1^st number: 5/80, 2^nd number: 2 6/7

5/80 - 20/7 is -313/112.

Find the least common denominator or LCM of the two denominators:
LCM of 80 and 7 is 560

Next, find the equivalent fraction of both fractional numbers with denominator 560
For the 1st fraction, since 80 × 7 = 560,
5/80 = 5 × 7/80 × 7 = 35/560
Likewise, for the 2nd fraction, since 7 × 80 = 560,
20/7 = 20 × 80/7 × 80 = 1600/560
Subtract the two like fractions:
35/560 - 1600/560 = 35 - 1600/560 = -1565/560
After reducing the fraction, the answer is -313/112

MathStep (Works offline)

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