Add 10/21 and 25/16, Solve 10/21 + 1 9/16 as a fraction

Add 10/21 and 25/16

1^st number: 10/21, 2^nd number: 1 9/16

10/21 + 25/16 is 685/336.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 16 is 336

Next, find the equivalent fraction of both fractional numbers with denominator 336
For the 1st fraction, since 21 × 16 = 336,
10/21 = 10 × 16/21 × 16 = 160/336
Likewise, for the 2nd fraction, since 16 × 21 = 336,
25/16 = 25 × 21/16 × 21 = 525/336
Add the two like fractions:
160/336 + 525/336 = 160 + 525/336 = 685/336
So, 10/21 + 25/16 = 685/336
In mixed form: 213/336

MathStep (Works offline)

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