Add 63/21 and 40/6, Solve 3 0/21 + 6 4/6 as a fraction

Add 63/21 and 40/6

1^st number: 3 0/21, 2^nd number: 6 4/6

63/21 + 40/6 is 29/3.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 6 is 42

Next, find the equivalent fraction of both fractional numbers with denominator 42
For the 1st fraction, since 21 × 2 = 42,
63/21 = 63 × 2/21 × 2 = 126/42
Likewise, for the 2nd fraction, since 6 × 7 = 42,
40/6 = 40 × 7/6 × 7 = 280/42
Add the two like fractions:
126/42 + 280/42 = 126 + 280/42 = 406/42
406/42 simplified gives 29/3
So, 63/21 + 40/6 = 29/3
In mixed form: 92/3

MathStep (Works offline)

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