Add 18/63 and 20/25, Solve 18/63 + 20/25 as a fraction

Add 18/63 and 20/25

18/63 + 20/25 is 38/35.

Find the least common denominator or LCM of the two denominators:
LCM of 63 and 25 is 1575

Next, find the equivalent fraction of both fractional numbers with denominator 1575
For the 1st fraction, since 63 × 25 = 1575,
18/63 = 18 × 25/63 × 25 = 450/1575
Likewise, for the 2nd fraction, since 25 × 63 = 1575,
20/25 = 20 × 63/25 × 63 = 1260/1575
Add the two like fractions:
450/1575 + 1260/1575 = 450 + 1260/1575 = 1710/1575
1710/1575 simplified gives 38/35
So, 18/63 + 20/25 = 38/35
In mixed form: 13/35

MathStep (Works offline)

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