what is the least common multiple of 5 and 9?

Explanation:

Step1: Check if the numbers are co - prime

5 and 9 have no common factors other than 1.

Step2: Use the co - prime LCM rule

For two co - prime numbers (a) and (b), the LCM is (a\times b). Here (a = 5) and (b=9), so (LCM(5,9)=5\times9).

Step3: Calculate the product

(5\times9 = 45).

Answer:

45