Add 5/21 and 63/9, Solve 5/21 + 7 0/9 as a fraction

Add 5/21 and 63/9

1^st number: 5/21, 2^nd number: 7 0/9

5/21 + 63/9 is 152/21.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 9 is 63

Next, find the equivalent fraction of both fractional numbers with denominator 63
For the 1st fraction, since 21 × 3 = 63,
5/21 = 5 × 3/21 × 3 = 15/63
Likewise, for the 2nd fraction, since 9 × 7 = 63,
63/9 = 63 × 7/9 × 7 = 441/63
Add the two like fractions:
15/63 + 441/63 = 15 + 441/63 = 456/63
456/63 simplified gives 152/21
So, 5/21 + 63/9 = 152/21
In mixed form: 75/21

MathStep (Works offline)

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