Add 6/21 and 63/35, Solve 6/21 + 1 28/35 as a fraction

Add 6/21 and 63/35

1^st number: 6/21, 2^nd number: 1 28/35

6/21 + 63/35 is 73/35.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 35 is 105

Next, find the equivalent fraction of both fractional numbers with denominator 105
For the 1st fraction, since 21 × 5 = 105,
6/21 = 6 × 5/21 × 5 = 30/105
Likewise, for the 2nd fraction, since 35 × 3 = 105,
63/35 = 63 × 3/35 × 3 = 189/105
Add the two like fractions:
30/105 + 189/105 = 30 + 189/105 = 219/105
219/105 simplified gives 73/35
So, 6/21 + 63/35 = 73/35
In mixed form: 23/35

MathStep (Works offline)

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