Subtract 1/40 from 72/6, Solve 12 0/6

Subtract 1/40 from 72/6

1^st number: 12 0/6, 2^nd number: 1/40

72/6 - 1/40 is 479/40.

Find the least common denominator or LCM of the two denominators:
LCM of 6 and 40 is 120

Next, find the equivalent fraction of both fractional numbers with denominator 120
For the 1st fraction, since 6 × 20 = 120,
72/6 = 72 × 20/6 × 20 = 1440/120
Likewise, for the 2nd fraction, since 40 × 3 = 120,
1/40 = 1 × 3/40 × 3 = 3/120
Subtract the two like fractions:
1440/120 - 3/120 = 1440 - 3/120 = 1437/120
After reducing the fraction, the answer is 479/40
In mixed form: 1139/40

MathStep (Works offline)

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