Add 18/15 and 7/84, Solve 1 3/15 + 7/84 as a fraction

Add 18/15 and 7/84

1^st number: 1 3/15, 2^nd number: 7/84

18/15 + 7/84 is 77/60.

Find the least common denominator or LCM of the two denominators:
LCM of 15 and 84 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 15 × 28 = 420,
18/15 = 18 × 28/15 × 28 = 504/420
Likewise, for the 2nd fraction, since 84 × 5 = 420,
7/84 = 7 × 5/84 × 5 = 35/420
Add the two like fractions:
504/420 + 35/420 = 504 + 35/420 = 539/420
539/420 simplified gives 77/60
So, 18/15 + 7/84 = 77/60
In mixed form: 117/60

MathStep (Works offline)

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