Question

Test the divisibility of the following numbers by 3:
(i) 733
(ii) 10038

Answer 1

A number is divisible by 3 if the sum of its digits is divisible by 3.

(i) 733 is not divisible by 3 because the sum of its digits, 7 + 3 + 3, is 13, which is not divisible by 3. (1 mark)
(ii) 10038 is divisible by 3 because the sum of its digits, 1 + 0 + 0 + 3 + 8, is 12, which is divisible by 3. (1 mark)