Add 27/18 and 12/63, Solve 1 9/18 + 12/63 as a fraction

Add 27/18 and 12/63

1^st number: 1 9/18, 2^nd number: 12/63

27/18 + 12/63 is 71/42.

Find the least common denominator or LCM of the two denominators:
LCM of 18 and 63 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 18 × 7 = 126,
27/18 = 27 × 7/18 × 7 = 189/126
Likewise, for the 2nd fraction, since 63 × 2 = 126,
12/63 = 12 × 2/63 × 2 = 24/126
Add the two like fractions:
189/126 + 24/126 = 189 + 24/126 = 213/126
213/126 simplified gives 71/42
So, 27/18 + 12/63 = 71/42
In mixed form: 129/42

MathStep (Works offline)

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