DIVISIBILITY RULES
BY-2
digit at unit place should be even
ex-324 is divisible by 2 because 4 is an even number.
BY-4
numbers formed by last 2 digits must be multiple of 4
or last 2 digits must be 0
ex-424 so 24 is divisible by 4 so it is divisible by 4
BY-5
digit at unit place should be 5 or 0
ex-45675 is divisible by 5 because it has 5 in its unit place
BY-9
sum of digits must be divisible by 9
ex-2718 the sum of its digits is 18 and 18 is divisible by 9 so 2718 is divisible by 9
BY-10
BY-3
BY-8
BY-11
digit at once place should be 0
ex-100 is divisible by 10 because it has 0 in its unit place
number formed by last 3 digits must be multiple of 8
or last three digits are zeroes
ex-6816 is divisible by 8 because last 3 digits are divisible by 8
sum of all digits should be multiple of 3
ex-63342 is divisible by 3 because sum of its digits is 24 and 24 divisible by 3
difference of the sum of digits at even places and odd places must be either 0 or a multiple of 11