Add 21/48 and 63/21, Solve 21/48 + 3 0/21 as a fraction

Add 21/48 and 63/21

1^st number: 21/48, 2^nd number: 3 0/21

21/48 + 63/21 is 55/16.

Find the least common denominator or LCM of the two denominators:
LCM of 48 and 21 is 336

Next, find the equivalent fraction of both fractional numbers with denominator 336
For the 1st fraction, since 48 × 7 = 336,
21/48 = 21 × 7/48 × 7 = 147/336
Likewise, for the 2nd fraction, since 21 × 16 = 336,
63/21 = 63 × 16/21 × 16 = 1008/336
Add the two like fractions:
147/336 + 1008/336 = 147 + 1008/336 = 1155/336
1155/336 simplified gives 55/16
So, 21/48 + 63/21 = 55/16
In mixed form: 37/16

MathStep (Works offline)

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