Add 7/21 and 28/25, Solve 7/21 + 1 3/25 as a fraction

Add 7/21 and 28/25

1^st number: 7/21, 2^nd number: 1 3/25

7/21 + 28/25 is 109/75.

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

Next, find the equivalent fraction of both fractional numbers with denominator 525
For the 1st fraction, since 21 × 25 = 525,
7/21 = 7 × 25/21 × 25 = 175/525
Likewise, for the 2nd fraction, since 25 × 21 = 525,
28/25 = 28 × 21/25 × 21 = 588/525
Add the two like fractions:
175/525 + 588/525 = 175 + 588/525 = 763/525
763/525 simplified gives 109/75
So, 7/21 + 28/25 = 109/75
In mixed form: 134/75

MathStep (Works offline)

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