Subtract 30/18 from 5/80, Solve 5/80

Subtract 30/18 from 5/80

1^st number: 5/80, 2^nd number: 1 12/18

5/80 - 30/18 is -77/48.

Find the least common denominator or LCM of the two denominators:
LCM of 80 and 18 is 720

Next, find the equivalent fraction of both fractional numbers with denominator 720
For the 1st fraction, since 80 × 9 = 720,
5/80 = 5 × 9/80 × 9 = 45/720
Likewise, for the 2nd fraction, since 18 × 40 = 720,
30/18 = 30 × 40/18 × 40 = 1200/720
Subtract the two like fractions:
45/720 - 1200/720 = 45 - 1200/720 = -1155/720
After reducing the fraction, the answer is -77/48

MathStep (Works offline)

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