Add 42/12 and 5/35, Solve 3 6/12 + 5/35 as a fraction

Add 42/12 and 5/35

1^st number: 3 6/12, 2^nd number: 5/35

42/12 + 5/35 is 51/14.

Find the least common denominator or LCM of the two denominators:
LCM of 12 and 35 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 12 × 35 = 420,
42/12 = 42 × 35/12 × 35 = 1470/420
Likewise, for the 2nd fraction, since 35 × 12 = 420,
5/35 = 5 × 12/35 × 12 = 60/420
Add the two like fractions:
1470/420 + 60/420 = 1470 + 60/420 = 1530/420
1530/420 simplified gives 51/14
So, 42/12 + 5/35 = 51/14
In mixed form: 39/14

MathStep (Works offline)

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