Add 21/24 and 28/10, Solve 21/24 + 2 8/10 as a fraction

Add 21/24 and 28/10

1^st number: 21/24, 2^nd number: 2 8/10

21/24 + 28/10 is 147/40.

Find the least common denominator or LCM of the two denominators:
LCM of 24 and 10 is 120

Next, find the equivalent fraction of both fractional numbers with denominator 120
For the 1st fraction, since 24 × 5 = 120,
21/24 = 21 × 5/24 × 5 = 105/120
Likewise, for the 2nd fraction, since 10 × 12 = 120,
28/10 = 28 × 12/10 × 12 = 336/120
Add the two like fractions:
105/120 + 336/120 = 105 + 336/120 = 441/120
441/120 simplified gives 147/40
So, 21/24 + 28/10 = 147/40
In mixed form: 327/40

MathStep (Works offline)

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