Add 15/12 and 42/3, Solve 1 3/12 + 14 0/3 as a fraction

Add 15/12 and 42/3

1^st number: 1 3/12, 2^nd number: 14 0/3

15/12 + 42/3 is 61/4.

Find the least common denominator or LCM of the two denominators:
LCM of 12 and 3 is 12

Next, find the equivalent fraction of both fractional numbers with denominator 12
For the 1st fraction, since 12 × 1 = 12,
15/12 = 15 × 1/12 × 1 = 15/12
Likewise, for the 2nd fraction, since 3 × 4 = 12,
42/3 = 42 × 4/3 × 4 = 168/12
Add the two like fractions:
15/12 + 168/12 = 15 + 168/12 = 183/12
183/12 simplified gives 61/4
So, 15/12 + 42/3 = 61/4
In mixed form: 151/4

MathStep (Works offline)

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