Add 18/12 and 3/84, Solve 1 6/12 + 3/84 as a fraction

Add 18/12 and 3/84

1^st number: 1 6/12, 2^nd number: 3/84

18/12 + 3/84 is 43/28.

Find the least common denominator or LCM of the two denominators:
LCM of 12 and 84 is 84

Next, find the equivalent fraction of both fractional numbers with denominator 84
For the 1st fraction, since 12 × 7 = 84,
18/12 = 18 × 7/12 × 7 = 126/84
Likewise, for the 2nd fraction, since 84 × 1 = 84,
3/84 = 3 × 1/84 × 1 = 3/84
Add the two like fractions:
126/84 + 3/84 = 126 + 3/84 = 129/84
129/84 simplified gives 43/28
So, 18/12 + 3/84 = 43/28
In mixed form: 115/28

MathStep (Works offline)

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