Why is the product of two numbers equal to the product of the greatest common divisor and the least common multiple of the two numbers?

Why is the product of two numbers equal to the product of the greatest common divisor and the least common multiple of the two numbers?

Suppose two numbers are a and B, and their greatest common divisor is a / C,
Then their least common multiple is (A / C) * A / (A / C) * B / (A / C)
B * C is obtained after simplification
So the greatest common divisor times the least common multiple = (A / C) * (b * c) = a * B
So the product of two numbers is equal to the product of the greatest common divisor and the least common multiple of the two numbers