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

Add 21/25 and 4/21

21/25 + 4/21 is 541/525.

Find the least common denominator or LCM of the two denominators:
LCM of 25 and 21 is 525

Next, find the equivalent fraction of both fractional numbers with denominator 525
For the 1st fraction, since 25 × 21 = 525,
21/25 = 21 × 21/25 × 21 = 441/525
Likewise, for the 2nd fraction, since 21 × 25 = 525,
4/21 = 4 × 25/21 × 25 = 100/525
Add the two like fractions:
441/525 + 100/525 = 441 + 100/525 = 541/525
So, 21/25 + 4/21 = 541/525
In mixed form: 116/525

MathStep (Works offline)

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