To understand the percentage difference between two numbers, we first need to understand what percentage means. Percentage is a way of expressing a number as a fraction of 100. For example, 50% means 50 out of 100 or 0.5 as a decimal.

Now, let's look at the percentage difference between 80 and 85. To find the percentage difference, we need to first find the absolute difference between the two numbers. Absolute difference means the difference without considering the sign. In this case, the absolute difference between 80 and 85 is 5.

Next, we need to find the average of the two numbers. The average of 80 and 85 is (80+85)/2 = 82.5.

Now, we can find the percentage difference by dividing the absolute difference by the average and multiplying by 100. So, the percentage difference between 80 and 85 is:

|80-85| / ((80+85)/2) x 100
= 5 / 82.5 x 100
= 6.06%

Therefore, the percentage difference between 80 and 85 is 6.06%. This means that 85 is 6.06% more than 80.