Add 63/3 and 6/21, Solve 21 0/3 + 6/21 as a fraction

Add 63/3 and 6/21

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

63/3 + 6/21 is 149/7.

Find the least common denominator or LCM of the two denominators:
LCM of 3 and 21 is 21

Next, find the equivalent fraction of both fractional numbers with denominator 21
For the 1st fraction, since 3 × 7 = 21,
63/3 = 63 × 7/3 × 7 = 441/21
Likewise, for the 2nd fraction, since 21 × 1 = 21,
6/21 = 6 × 1/21 × 1 = 6/21
Add the two like fractions:
441/21 + 6/21 = 441 + 6/21 = 447/21
447/21 simplified gives 149/7
So, 63/3 + 6/21 = 149/7
In mixed form: 212/7

MathStep (Works offline)

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