To understand the percentage difference between 15 and 16, we first need to understand what percentage difference means. Percentage difference is a way to measure the difference between two values as a percentage of one of the values. In this case, we are comparing 15 and 16.

To calculate the percentage difference between 15 and 16, we first need to find the absolute difference between the two values. The absolute difference is simply the difference between the two values without considering whether one is greater than the other. In this case, the absolute difference between 15 and 16 is 1.

Next, we need to find the average of the two values. The average of 15 and 16 is (15+16)/2 = 15.5.

Now, we can calculate the percentage difference by dividing the absolute difference by the average and multiplying by 100. So, the percentage difference between 15 and 16 is:

|15-16| / 15.5 x 100 = 6.45%

Therefore, the percentage difference between 15 and 16 is 6.45%. This means that 16 is 6.45% greater than 15.