Add 3/12 and 12/70, Solve 3/12 + 12/70 as a fraction

Add 3/12 and 12/70

3/12 + 12/70 is 59/140.

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

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 12 × 35 = 420,
3/12 = 3 × 35/12 × 35 = 105/420
Likewise, for the 2nd fraction, since 70 × 6 = 420,
12/70 = 12 × 6/70 × 6 = 72/420
Add the two like fractions:
105/420 + 72/420 = 105 + 72/420 = 177/420
177/420 simplified gives 59/140
So, 3/12 + 12/70 = 59/140

MathStep (Works offline)

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