Add 42/12 and 36/7, Solve 3 6/12 + 5 1/7 as a fraction

Add 42/12 and 36/7

1^st number: 3 6/12, 2^nd number: 5 1/7

42/12 + 36/7 is 121/14.

Find the least common denominator or LCM of the two denominators:
LCM of 12 and 7 is 84

Next, find the equivalent fraction of both fractional numbers with denominator 84
For the 1st fraction, since 12 × 7 = 84,
42/12 = 42 × 7/12 × 7 = 294/84
Likewise, for the 2nd fraction, since 7 × 12 = 84,
36/7 = 36 × 12/7 × 12 = 432/84
Add the two like fractions:
294/84 + 432/84 = 294 + 432/84 = 726/84
726/84 simplified gives 121/14
So, 42/12 + 36/7 = 121/14
In mixed form: 89/14

MathStep (Works offline)

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