1. Tests of Divisibility 1 - All integers can be divided by 1
2 - All even numbers can be divided by 2
i.e. those ending in 0, 2, 4, 6, 8
3 – Add the digits of the number together, if the answer is in the 3 x table then
the number is divisible by 3
e.g = 9
9 is in the 3 x table so 126 is divisible by 3
4 – the last two digits of the number are divisible by 4
e.g the last two digits are 12 which is
divisible by 4, so 4012 is divisible by 4
5 - All numbers ending in 0 or 5
6 – An even number divisible by 3 (see test for 3)
8 – the last three digits of the number are divisible by 8
9 – Add the digits of the number together, if the answer is in the 9 x table then
the number is divisible by 9