Add 18/81 and 21/25
18/81 + 21/25 is 239/225.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 25 is 2025
Next, find the equivalent fraction of both fractional numbers with denominator 2025 - For the 1st fraction, since 81 × 25 = 2025,
18/81 = 18 × 25/81 × 25 = 450/2025 - Likewise, for the 2nd fraction, since 25 × 81 = 2025,
21/25 = 21 × 81/25 × 81 = 1701/2025 - Add the two like fractions:
450/2025 + 1701/2025 = 450 + 1701/2025 = 2151/2025 - 2151/2025 simplified gives 239/225
- So, 18/81 + 21/25 = 239/225
In mixed form: 114/225
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/81+21/25 18/81+42/25 18/81+21/50 54/81+21/25 18/81+63/25 18/81+21/75 90/81+21/25