What is the least common denominator of 2/5 and 11/18

Question

Fractions and mixed numbers

Answer 1

To find the least common denominator, reduce the factors of each denominator to prime numbers. In your example, the denominators are 5 and 18. The factors of these numbers follow.

5

5 x 1

5 is a prime number; therefore, its only factors are 5 and 1.

18

2 x 3 x 3

These are the factors of 18 reduced to prime numbers.

Because there are none of the same factors in 5 and 18, the least common denominator for these fractions is 5 x 18 which equals 90.