What is a 4 digit number divisible by five and nine?

Answer 1

A 4-digit number divisible by both 5 and 9 must be divisible by their least common multiple, which is 45. To find a 4-digit number divisible by 45, we need to find a number that ends in 0 and is divisible by 45. The smallest 4-digit number that fits these criteria is 1005 (45 x 22 = 990, and adding 15 gives us 1005).

Answer 2

You just need a 4 digit number divisible by 5x9 ie by 45, so 4500 will do.