Add 28/45 and 81/63, Solve 28/45 + 1 18/63 as a fraction

Add 28/45 and 81/63

1^st number: 28/45, 2^nd number: 1 18/63

28/45 + 81/63 is 601/315.

Find the least common denominator or LCM of the two denominators:
LCM of 45 and 63 is 315

Next, find the equivalent fraction of both fractional numbers with denominator 315
For the 1st fraction, since 45 × 7 = 315,
28/45 = 28 × 7/45 × 7 = 196/315
Likewise, for the 2nd fraction, since 63 × 5 = 315,
81/63 = 81 × 5/63 × 5 = 405/315
Add the two like fractions:
196/315 + 405/315 = 196 + 405/315 = 601/315
So, 28/45 + 81/63 = 601/315
In mixed form: 1286/315

MathStep (Works offline)

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