Subtract 4/80 from 28/16, Solve 1 12/16

Subtract 4/80 from 28/16

1^st number: 1 12/16, 2^nd number: 4/80

28/16 - 4/80 is 17/10.

Find the least common denominator or LCM of the two denominators:
LCM of 16 and 80 is 80

Next, find the equivalent fraction of both fractional numbers with denominator 80
For the 1st fraction, since 16 × 5 = 80,
28/16 = 28 × 5/16 × 5 = 140/80
Likewise, for the 2nd fraction, since 80 × 1 = 80,
4/80 = 4 × 1/80 × 1 = 4/80
Subtract the two like fractions:
140/80 - 4/80 = 140 - 4/80 = 136/80
After reducing the fraction, the answer is 17/10
In mixed form: 17/10

MathStep (Works offline)

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