Add 36/12 and 21/70, Solve 3 0/12 + 21/70 as a fraction

Add 36/12 and 21/70

1^st number: 3 0/12, 2^nd number: 21/70

36/12 + 21/70 is 33/10.

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,
36/12 = 36 × 35/12 × 35 = 1260/420
Likewise, for the 2nd fraction, since 70 × 6 = 420,
21/70 = 21 × 6/70 × 6 = 126/420
Add the two like fractions:
1260/420 + 126/420 = 1260 + 126/420 = 1386/420
1386/420 simplified gives 33/10
So, 36/12 + 21/70 = 33/10
In mixed form: 33/10

MathStep (Works offline)

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