Add 5/24 and 21/18, Solve 5/24 + 1 3/18 as a fraction

Add 5/24 and 21/18

1^st number: 5/24, 2^nd number: 1 3/18

5/24 + 21/18 is 11/8.

Find the least common denominator or LCM of the two denominators:
LCM of 24 and 18 is 72

Next, find the equivalent fraction of both fractional numbers with denominator 72
For the 1st fraction, since 24 × 3 = 72,
5/24 = 5 × 3/24 × 3 = 15/72
Likewise, for the 2nd fraction, since 18 × 4 = 72,
21/18 = 21 × 4/18 × 4 = 84/72
Add the two like fractions:
15/72 + 84/72 = 15 + 84/72 = 99/72
99/72 simplified gives 11/8
So, 5/24 + 21/18 = 11/8
In mixed form: 13/8

MathStep (Works offline)

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