Add 15/12 and 4/35, Solve 1 3/12 + 4/35 as a fraction

Add 15/12 and 4/35

1^st number: 1 3/12, 2^nd number: 4/35

15/12 + 4/35 is 191/140.

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,
15/12 = 15 × 35/12 × 35 = 525/420
Likewise, for the 2nd fraction, since 35 × 12 = 420,
4/35 = 4 × 12/35 × 12 = 48/420
Add the two like fractions:
525/420 + 48/420 = 525 + 48/420 = 573/420
573/420 simplified gives 191/140
So, 15/12 + 4/35 = 191/140
In mixed form: 151/140

MathStep (Works offline)

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