Add 3/54 and 45/12, Solve 3/54 + 3 9/12 as a fraction

Add 3/54 and 45/12

1^st number: 3/54, 2^nd number: 3 9/12

3/54 + 45/12 is 137/36.

Find the least common denominator or LCM of the two denominators:
LCM of 54 and 12 is 108

Next, find the equivalent fraction of both fractional numbers with denominator 108
For the 1st fraction, since 54 × 2 = 108,
3/54 = 3 × 2/54 × 2 = 6/108
Likewise, for the 2nd fraction, since 12 × 9 = 108,
45/12 = 45 × 9/12 × 9 = 405/108
Add the two like fractions:
6/108 + 405/108 = 6 + 405/108 = 411/108
411/108 simplified gives 137/36
So, 3/54 + 45/12 = 137/36
In mixed form: 329/36

MathStep (Works offline)

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