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 87 and 88. 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 87 and 88 is 1.

Next, we need to find the average of the two numbers. The average of 87 and 88 is (87+88)/2 = 87.5.

Now, we can find the percentage difference by dividing the absolute difference by the average and multiplying by 100. So, the percentage difference between 87 and 88 is:

|87-88| / ((87+88)/2) x 100
= 1 / 87.5 x 100
= 1.14%

Therefore, the percentage difference between 87 and 88 is 1.14%. This means that 88 is 1.14% greater than 87.