Question

Use the divisibility tests to determine whether the following numbers are divisible by 2, 3, 4, 5, 6, 9 or 11.

(11) 4,203

Answer 1

We can observe that the sum of the digits 4, 2, 0 and 3 is 9, which is divisible by both 3 and 9.
If the sum of all the digits in a number is divisible by 3 and 9, then the number is divisible by 3 and 9. So, the number 4203 is divisible by both 3 and 9.