Add 3/2 and 18/84, Solve 1 1/2 + 18/84 as a fraction

Add 3/2 and 18/84

1^st number: 1 1/2, 2^nd number: 18/84

3/2 + 18/84 is 12/7.

Find the least common denominator or LCM of the two denominators:
LCM of 2 and 84 is 84

Next, find the equivalent fraction of both fractional numbers with denominator 84
For the 1st fraction, since 2 × 42 = 84,
3/2 = 3 × 42/2 × 42 = 126/84
Likewise, for the 2nd fraction, since 84 × 1 = 84,
18/84 = 18 × 1/84 × 1 = 18/84
Add the two like fractions:
126/84 + 18/84 = 126 + 18/84 = 144/84
144/84 simplified gives 12/7
So, 3/2 + 18/84 = 12/7
In mixed form: 15/7

MathStep (Works offline)

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