Add 12/54 and 25/21, Solve 12/54 + 1 4/21 as a fraction

Add 12/54 and 25/21

1^st number: 12/54, 2^nd number: 1 4/21

12/54 + 25/21 is 89/63.

Find the least common denominator or LCM of the two denominators:
LCM of 54 and 21 is 378

Next, find the equivalent fraction of both fractional numbers with denominator 378
For the 1st fraction, since 54 × 7 = 378,
12/54 = 12 × 7/54 × 7 = 84/378
Likewise, for the 2nd fraction, since 21 × 18 = 378,
25/21 = 25 × 18/21 × 18 = 450/378
Add the two like fractions:
84/378 + 450/378 = 84 + 450/378 = 534/378
534/378 simplified gives 89/63
So, 12/54 + 25/21 = 89/63
In mixed form: 126/63

MathStep (Works offline)

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