We have to find the largest four digit number divisible by 16.
The largest four-digit number = 9999
Therefore, dividend = 9999
Divisor = 16

Here, we get remainder = 15
Therefore, 15 must be subtracted from 9999 to get the largest four digit number that is divisible by 16.
i.e., 9999 - 15 = 9984
Thus, 9984 is the largest four-digit number that is divisible by 16.