Subtract 81/40 from 12/3, Solve 4 0/3

Subtract 81/40 from 12/3

1^st number: 4 0/3, 2^nd number: 2 1/40

12/3 - 81/40 is 79/40.

Find the least common denominator or LCM of the two denominators:
LCM of 3 and 40 is 120

Next, find the equivalent fraction of both fractional numbers with denominator 120
For the 1st fraction, since 3 × 40 = 120,
12/3 = 12 × 40/3 × 40 = 480/120
Likewise, for the 2nd fraction, since 40 × 3 = 120,
81/40 = 81 × 3/40 × 3 = 243/120
Subtract the two like fractions:
480/120 - 243/120 = 480 - 243/120 = 237/120
After reducing the fraction, the answer is 79/40
In mixed form: 139/40

MathStep (Works offline)

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