Add 12/70 and 42/30, Solve 12/70 + 1 12/30 as a fraction

Add 12/70 and 42/30

1^st number: 12/70, 2^nd number: 1 12/30

12/70 + 42/30 is 11/7.

Find the least common denominator or LCM of the two denominators:
LCM of 70 and 30 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 70 × 3 = 210,
12/70 = 12 × 3/70 × 3 = 36/210
Likewise, for the 2nd fraction, since 30 × 7 = 210,
42/30 = 42 × 7/30 × 7 = 294/210
Add the two like fractions:
36/210 + 294/210 = 36 + 294/210 = 330/210
330/210 simplified gives 11/7
So, 12/70 + 42/30 = 11/7
In mixed form: 14/7

MathStep (Works offline)

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