Add 12/7 and 3/18, Solve 1 5/7 + 3/18 as a fraction

Add 12/7 and 3/18

1^st number: 1 5/7, 2^nd number: 3/18

12/7 + 3/18 is 79/42.

Find the least common denominator or LCM of the two denominators:
LCM of 7 and 18 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 7 × 18 = 126,
12/7 = 12 × 18/7 × 18 = 216/126
Likewise, for the 2nd fraction, since 18 × 7 = 126,
3/18 = 3 × 7/18 × 7 = 21/126
Add the two like fractions:
216/126 + 21/126 = 216 + 21/126 = 237/126
237/126 simplified gives 79/42
So, 12/7 + 3/18 = 79/42
In mixed form: 137/42

MathStep (Works offline)

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