Subtract 3/81 from 9/2, Solve 4 1/2

Subtract 3/81 from 9/2

1^st number: 4 1/2, 2^nd number: 3/81

9/2 - 3/81 is 241/54.

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,
9/2 = 9 × 81/2 × 81 = 729/162
Likewise, for the 2nd fraction, since 81 × 2 = 162,
3/81 = 3 × 2/81 × 2 = 6/162
Subtract the two like fractions:
729/162 - 6/162 = 729 - 6/162 = 723/162
After reducing the fraction, the answer is 241/54
In mixed form: 425/54

MathStep (Works offline)

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