Add 63/2 and 28/21, Solve 31 1/2 + 1 7/21 as a fraction

Add 63/2 and 28/21

1^st number: 31 1/2, 2^nd number: 1 7/21

63/2 + 28/21 is 197/6.

Find the least common denominator or LCM of the two denominators:
LCM of 2 and 21 is 42

Next, find the equivalent fraction of both fractional numbers with denominator 42
For the 1st fraction, since 2 × 21 = 42,
63/2 = 63 × 21/2 × 21 = 1323/42
Likewise, for the 2nd fraction, since 21 × 2 = 42,
28/21 = 28 × 2/21 × 2 = 56/42
Add the two like fractions:
1323/42 + 56/42 = 1323 + 56/42 = 1379/42
1379/42 simplified gives 197/6
So, 63/2 + 28/21 = 197/6
In mixed form: 325/6

MathStep (Works offline)

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