Divisibility by 13 ?

How many two digit number are divisible by 13 ? Also find their sum.

What is the value of * if the number 56*890 will be exactly divisible by 13 ?

How many numbers between 500 and 1000 are divisible by 13 ?

Check whether 12478375 is divisible by 13 or not.

If ( 12^n + 1) is divisible by 13, then n is

If the number 413283P759387 is divisible by 13. Then what is the value of P ?

m is said to be related to n if m and n are integers and m-n is divisible by 13. Does this define an equivalence relation?