Add 12/24 and 25/21, Solve 12/24 + 1 4/21 as a fraction

Add 12/24 and 25/21

1^st number: 12/24, 2^nd number: 1 4/21

12/24 + 25/21 is 71/42.

Find the least common denominator or LCM of the two denominators:
LCM of 24 and 21 is 168

Next, find the equivalent fraction of both fractional numbers with denominator 168
For the 1st fraction, since 24 × 7 = 168,
12/24 = 12 × 7/24 × 7 = 84/168
Likewise, for the 2nd fraction, since 21 × 8 = 168,
25/21 = 25 × 8/21 × 8 = 200/168
Add the two like fractions:
84/168 + 200/168 = 84 + 200/168 = 284/168
284/168 simplified gives 71/42
So, 12/24 + 25/21 = 71/42
In mixed form: 129/42

MathStep (Works offline)

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