Question

Which of the following numbers are divisible by 3?
a) 915 b) 1008
[2 marks]

Answer 1

a) Sum of the digits of 915 is
= 9 + 1 + 5 = 15
[0.5 mark]
so, 15 is divisible by 3.
Hence 915 is divisible by 3
[0.5 mark]

b) Sum of the digits of 1008 is
= 1 + 0 + 0 + 8 = 9
[0.5 mark]
so, 9 is divisible by 3.
Hence 1008 is divisible by 3
[0.5 mark]