Add 18/63 and 80/12, Solve 18/63 + 6 8/12 as a fraction

Add 18/63 and 80/12

1^st number: 18/63, 2^nd number: 6 8/12

18/63 + 80/12 is 146/21.

Find the least common denominator or LCM of the two denominators:
LCM of 63 and 12 is 252

Next, find the equivalent fraction of both fractional numbers with denominator 252
For the 1st fraction, since 63 × 4 = 252,
18/63 = 18 × 4/63 × 4 = 72/252
Likewise, for the 2nd fraction, since 12 × 21 = 252,
80/12 = 80 × 21/12 × 21 = 1680/252
Add the two like fractions:
72/252 + 1680/252 = 72 + 1680/252 = 1752/252
1752/252 simplified gives 146/21
So, 18/63 + 80/12 = 146/21
In mixed form: 620/21

MathStep (Works offline)

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