Subtract 3/81 from 80/2, Solve 40 0/2

Subtract 3/81 from 80/2

1^st number: 40 0/2, 2^nd number: 3/81

80/2 - 3/81 is 1079/27.

Find the least common denominator or LCM of the two denominators:
LCM of 2 and 81 is 162

Next, find the equivalent fraction of both fractional numbers with denominator 162
For the 1st fraction, since 2 × 81 = 162,
80/2 = 80 × 81/2 × 81 = 6480/162
Likewise, for the 2nd fraction, since 81 × 2 = 162,
3/81 = 3 × 2/81 × 2 = 6/162
Subtract the two like fractions:
6480/162 - 6/162 = 6480 - 6/162 = 6474/162
After reducing the fraction, the answer is 1079/27
In mixed form: 3926/27

MathStep (Works offline)

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