Add 64/21 and 7/25, Solve 3 1/21 + 7/25 as a fraction

Add 64/21 and 7/25

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

64/21 + 7/25 is 1747/525.

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,
64/21 = 64 × 25/21 × 25 = 1600/525
Likewise, for the 2nd fraction, since 25 × 21 = 525,
7/25 = 7 × 21/25 × 21 = 147/525
Add the two like fractions:
1600/525 + 147/525 = 1600 + 147/525 = 1747/525
So, 64/21 + 7/25 = 1747/525
In mixed form: 3172/525

MathStep (Works offline)

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