Subtract 21/12 from 40/2, Solve 20 0/2

Subtract 21/12 from 40/2

1^st number: 20 0/2, 2^nd number: 1 9/12

40/2 - 21/12 is 73/4.

Find the least common denominator or LCM of the two denominators:
LCM of 2 and 12 is 12

Next, find the equivalent fraction of both fractional numbers with denominator 12
For the 1st fraction, since 2 × 6 = 12,
40/2 = 40 × 6/2 × 6 = 240/12
Likewise, for the 2nd fraction, since 12 × 1 = 12,
21/12 = 21 × 1/12 × 1 = 21/12
Subtract the two like fractions:
240/12 - 21/12 = 240 - 21/12 = 219/12
After reducing the fraction, the answer is 73/4
In mixed form: 181/4

MathStep (Works offline)

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