Add 20/81 and 75/24, Solve 20/81 + 3 3/24 as a fraction

Add 20/81 and 75/24

1^st number: 20/81, 2^nd number: 3 3/24

20/81 + 75/24 is 2185/648.

Find the least common denominator or LCM of the two denominators:
LCM of 81 and 24 is 648

Next, find the equivalent fraction of both fractional numbers with denominator 648
For the 1st fraction, since 81 × 8 = 648,
20/81 = 20 × 8/81 × 8 = 160/648
Likewise, for the 2nd fraction, since 24 × 27 = 648,
75/24 = 75 × 27/24 × 27 = 2025/648
Add the two like fractions:
160/648 + 2025/648 = 160 + 2025/648 = 2185/648
So, 20/81 + 75/24 = 2185/648
In mixed form: 3241/648

MathStep (Works offline)

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