Add 21/9 and 28/63, Solve 2 3/9 + 28/63 as a fraction

Add 21/9 and 28/63

1^st number: 2 3/9, 2^nd number: 28/63

21/9 + 28/63 is 25/9.

Find the least common denominator or LCM of the two denominators:
LCM of 9 and 63 is 63

Next, find the equivalent fraction of both fractional numbers with denominator 63
For the 1st fraction, since 9 × 7 = 63,
21/9 = 21 × 7/9 × 7 = 147/63
Likewise, for the 2nd fraction, since 63 × 1 = 63,
28/63 = 28 × 1/63 × 1 = 28/63
Add the two like fractions:
147/63 + 28/63 = 147 + 28/63 = 175/63
175/63 simplified gives 25/9
So, 21/9 + 28/63 = 25/9
In mixed form: 27/9

MathStep (Works offline)

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