Add 21/42 and 27/25, Solve 21/42 + 1 2/25 as a fraction

Add 21/42 and 27/25

1^st number: 21/42, 2^nd number: 1 2/25

21/42 + 27/25 is 79/50.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 25 is 1050

Next, find the equivalent fraction of both fractional numbers with denominator 1050
For the 1st fraction, since 42 × 25 = 1050,
21/42 = 21 × 25/42 × 25 = 525/1050
Likewise, for the 2nd fraction, since 25 × 42 = 1050,
27/25 = 27 × 42/25 × 42 = 1134/1050
Add the two like fractions:
525/1050 + 1134/1050 = 525 + 1134/1050 = 1659/1050
1659/1050 simplified gives 79/50
So, 21/42 + 27/25 = 79/50
In mixed form: 129/50

MathStep (Works offline)

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