Add 12/2 and 72/21, Solve 6 0/2 + 3 9/21 as a fraction

Add 12/2 and 72/21

1^st number: 6 0/2, 2^nd number: 3 9/21

12/2 + 72/21 is 66/7.

Find the least common denominator or LCM of the two denominators:
LCM of 2 and 21 is 42

Next, find the equivalent fraction of both fractional numbers with denominator 42
For the 1st fraction, since 2 × 21 = 42,
12/2 = 12 × 21/2 × 21 = 252/42
Likewise, for the 2nd fraction, since 21 × 2 = 42,
72/21 = 72 × 2/21 × 2 = 144/42
Add the two like fractions:
252/42 + 144/42 = 252 + 144/42 = 396/42
396/42 simplified gives 66/7
So, 12/2 + 72/21 = 66/7
In mixed form: 93/7

MathStep (Works offline)

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