You multiply the first digit from the right by 1, the second digit from the right by 16, the third digit from the right by 16 squared, the fourth digit from the right by 16 cubed, etc., then add everything together.
It is: 16*16*16 = 4096
The greatest 4-digit number that is divisible by 16 is 9984
Because the value of each digit is 16 times the value of a unit in the digit to its right.
That all depends upon what the first digit is. For example: First digit is 1. Answer is: 8 First digit is 2. Answer is 16. First digit is 3. Answer is 24.