Add 15/21 and 63/6, Solve 15/21 + 10 3/6 as a fraction

Add 15/21 and 63/6

1^st number: 15/21, 2^nd number: 10 3/6

15/21 + 63/6 is 157/14.

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,
15/21 = 15 × 2/21 × 2 = 30/42
Likewise, for the 2nd fraction, since 6 × 7 = 42,
63/6 = 63 × 7/6 × 7 = 441/42
Add the two like fractions:
30/42 + 441/42 = 30 + 441/42 = 471/42
471/42 simplified gives 157/14
So, 15/21 + 63/6 = 157/14
In mixed form: 113/14

MathStep (Works offline)

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