Question

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Answer 1

Explanation:

How to check divisibility by 3?

A number is said to be divisible by 3 if the sum of all digits of that number is divisible by 3. For example, the number 495 is exactly divisible by 3. The sum of all digits are 4 + 9 + 5 = 18 and 18 is exactly divided by 3.

How to check divisibility by 9?

If the sum of the digits of a number is divisible by 9, then the number is divisible by 9. Some examples of numbers divisible by 9 are as follows. The number 51984 is divisible by 9 because the sum of its digits 5+1+9+8+4=27 is divisible by 9.

Answer 2

Answer:

Step-by-step explanation:

a) Divisible by 3 and 9 = 36, 90, 108, 333, 675, 855, 990 ,2709

b) Divisible 3 but not 9 = 165, 75, 87,39, 636, 675,528, 813, 903,6315