Add 45/12 and 5/30, Solve 3 9/12 + 5/30 as a fraction

Add 45/12 and 5/30

1^st number: 3 9/12, 2^nd number: 5/30

45/12 + 5/30 is 47/12.

Find the least common denominator or LCM of the two denominators:
LCM of 12 and 30 is 60

Next, find the equivalent fraction of both fractional numbers with denominator 60
For the 1st fraction, since 12 × 5 = 60,
45/12 = 45 × 5/12 × 5 = 225/60
Likewise, for the 2nd fraction, since 30 × 2 = 60,
5/30 = 5 × 2/30 × 2 = 10/60
Add the two like fractions:
225/60 + 10/60 = 225 + 10/60 = 235/60
235/60 simplified gives 47/12
So, 45/12 + 5/30 = 47/12
In mixed form: 311/12

MathStep (Works offline)

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