Subtract 3/80 from 21/10, Solve 2 1/10

Subtract 3/80 from 21/10

1^st number: 2 1/10, 2^nd number: 3/80

21/10 - 3/80 is 33/16.

Find the least common denominator or LCM of the two denominators:
LCM of 10 and 80 is 80

Next, find the equivalent fraction of both fractional numbers with denominator 80
For the 1st fraction, since 10 × 8 = 80,
21/10 = 21 × 8/10 × 8 = 168/80
Likewise, for the 2nd fraction, since 80 × 1 = 80,
3/80 = 3 × 1/80 × 1 = 3/80
Subtract the two like fractions:
168/80 - 3/80 = 168 - 3/80 = 165/80
After reducing the fraction, the answer is 33/16
In mixed form: 21/16

MathStep (Works offline)

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