Add 18/15 and 3/63, Solve 1 3/15 + 3/63 as a fraction

Add 18/15 and 3/63

1^st number: 1 3/15, 2^nd number: 3/63

18/15 + 3/63 is 131/105.

Find the least common denominator or LCM of the two denominators:
LCM of 15 and 63 is 315

Next, find the equivalent fraction of both fractional numbers with denominator 315
For the 1st fraction, since 15 × 21 = 315,
18/15 = 18 × 21/15 × 21 = 378/315
Likewise, for the 2nd fraction, since 63 × 5 = 315,
3/63 = 3 × 5/63 × 5 = 15/315
Add the two like fractions:
378/315 + 15/315 = 378 + 15/315 = 393/315
393/315 simplified gives 131/105
So, 18/15 + 3/63 = 131/105
In mixed form: 126/105

MathStep (Works offline)

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