Add 28/36 and 21/9, Solve 28/36 + 2 3/9 as a fraction

Add 28/36 and 21/9

1^st number: 28/36, 2^nd number: 2 3/9

28/36 + 21/9 is 28/9.

Find the least common denominator or LCM of the two denominators:
LCM of 36 and 9 is 36

Next, find the equivalent fraction of both fractional numbers with denominator 36
For the 1st fraction, since 36 × 1 = 36,
28/36 = 28 × 1/36 × 1 = 28/36
Likewise, for the 2nd fraction, since 9 × 4 = 36,
21/9 = 21 × 4/9 × 4 = 84/36
Add the two like fractions:
28/36 + 84/36 = 28 + 84/36 = 112/36
112/36 simplified gives 28/9
So, 28/36 + 21/9 = 28/9
In mixed form: 31/9

MathStep (Works offline)

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