Add 42/70 and 5/12, Solve 42/70 + 5/12 as a fraction

Add 42/70 and 5/12

42/70 + 5/12 is 61/60.

Find the least common denominator or LCM of the two denominators:
LCM of 70 and 12 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 70 × 6 = 420,
42/70 = 42 × 6/70 × 6 = 252/420
Likewise, for the 2nd fraction, since 12 × 35 = 420,
5/12 = 5 × 35/12 × 35 = 175/420
Add the two like fractions:
252/420 + 175/420 = 252 + 175/420 = 427/420
427/420 simplified gives 61/60
So, 42/70 + 5/12 = 61/60
In mixed form: 11/60

MathStep (Works offline)

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