Add 18/84 and 84/8, Solve 18/84 + 10 4/8 as a fraction

Add 18/84 and 84/8

1^st number: 18/84, 2^nd number: 10 4/8

18/84 + 84/8 is 75/7.

Find the least common denominator or LCM of the two denominators:
LCM of 84 and 8 is 168

Next, find the equivalent fraction of both fractional numbers with denominator 168
For the 1st fraction, since 84 × 2 = 168,
18/84 = 18 × 2/84 × 2 = 36/168
Likewise, for the 2nd fraction, since 8 × 21 = 168,
84/8 = 84 × 21/8 × 21 = 1764/168
Add the two like fractions:
36/168 + 1764/168 = 36 + 1764/168 = 1800/168
1800/168 simplified gives 75/7
So, 18/84 + 84/8 = 75/7
In mixed form: 105/7

MathStep (Works offline)

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