Question

divisibility of 7 and 5, 6,
8,9,10.

Answer 1

3 - the sum of all the digits should be divisible by 3 eg - 396 - sum 18 divisible by 3
2 - the last no should be divisible by 2 
the divisibility of both will be the divisibility of 6
5 - the last no should be  5 or 0
9 - the sum of all the digits should be divisible by 9
10 - the last no. should be 0
8 - the last two no. shud be divisible by 8
7 - the last two nos divisible by 7