Subtract 18/80 from 8/5, Solve 1 3/5

Subtract 18/80 from 8/5

1^st number: 1 3/5, 2^nd number: 18/80

8/5 - 18/80 is 11/8.

Find the least common denominator or LCM of the two denominators:
LCM of 5 and 80 is 80

Next, find the equivalent fraction of both fractional numbers with denominator 80
For the 1st fraction, since 5 × 16 = 80,
8/5 = 8 × 16/5 × 16 = 128/80
Likewise, for the 2nd fraction, since 80 × 1 = 80,
18/80 = 18 × 1/80 × 1 = 18/80
Subtract the two like fractions:
128/80 - 18/80 = 128 - 18/80 = 110/80
After reducing the fraction, the answer is 11/8
In mixed form: 13/8

MathStep (Works offline)

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