Add 21/50 and 36/42, Solve 21/50 + 36/42 as a fraction

Add 21/50 and 36/42

21/50 + 36/42 is 447/350.

Find the least common denominator or LCM of the two denominators:
LCM of 50 and 42 is 1050

Next, find the equivalent fraction of both fractional numbers with denominator 1050
For the 1st fraction, since 50 × 21 = 1050,
21/50 = 21 × 21/50 × 21 = 441/1050
Likewise, for the 2nd fraction, since 42 × 25 = 1050,
36/42 = 36 × 25/42 × 25 = 900/1050
Add the two like fractions:
441/1050 + 900/1050 = 441 + 900/1050 = 1341/1050
1341/1050 simplified gives 447/350
So, 21/50 + 36/42 = 447/350
In mixed form: 197/350

MathStep (Works offline)

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