Subtract 63/12 from 7/80, Solve 7/80

Subtract 63/12 from 7/80

1^st number: 7/80, 2^nd number: 5 3/12

7/80 - 63/12 is -413/80.

Find the least common denominator or LCM of the two denominators:
LCM of 80 and 12 is 240

Next, find the equivalent fraction of both fractional numbers with denominator 240
For the 1st fraction, since 80 × 3 = 240,
7/80 = 7 × 3/80 × 3 = 21/240
Likewise, for the 2nd fraction, since 12 × 20 = 240,
63/12 = 63 × 20/12 × 20 = 1260/240
Subtract the two like fractions:
21/240 - 1260/240 = 21 - 1260/240 = -1239/240
After reducing the fraction, the answer is -413/80

MathStep (Works offline)

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