Question

find the smallest nunber tgat can be subtracted from1965,so that it becomes divisible by 4

Answer 1

its 4 because 1965-4=1964 which is divisible by 4

Answer 2

we clearly know that the divisibility test for 4 is that the last 2 digits of the numbers should be divisible by 4, hence subtracting 1 from the given number will make the last 2 digits 64 which is divisible by 4 and then 1964 becomes divisible by 4.