2
- if the number end in even numbers ( 0, 2, 4, 6, 8 )
3
- if the sum of its digit is divisible by 3
Ex. 561 = 5+6+1 = 12 (12 is divisible by 3)
4
- if the number has 2 last digit divisible by 4
Ex. 252 ; 52 is divisible by 4 so 252 is divisible by 4
5
- if the numbers end in 0 and 5
6
- if the number is even and the sum of its digits is divisible by 3, the number is divisible by 6
Ex. 498 ; 4+9+8 = 21, 21 is divisible by 3 so 498 is divisible 6
7
- multiply the last digit by 2 subtract the product from the remaining digits, and if the difference is divisible by 7 number is divisible by 7. Repeat the process if the number is big.
Ex. 24 822 - 2*2 = 4 ➡️ 2 482 - 4 = 2 478
2 478 - 8*2 = 16 ➡️ 247 - 16 = 231
231 - 1*2 = 2 ➡️ 23 - 2 = 21
8
- if the number has 3 last digits divisible by 8
Ex. 1 432 , 432 / 8 = 54 ; so 1 432 is divisible by 8
9
- if the sum of the digits is divisible by 9
Ex. 2 898 , 2+8+9+8 = 27 ; 27 is divisible by 9 so 2 898 is divisible by 9
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