To find the percentage difference between two numbers, we first need to calculate the absolute difference between them. In this case, the absolute difference between 144 and 169 is 25 (169 - 144 = 25).

Next, we need to find the average of the two numbers. The average of 144 and 169 is (144 + 169) / 2 = 156.5.

Now, we can calculate the percentage difference by dividing the absolute difference by the average and multiplying by 100. So, the percentage difference between 144 and 169 is (25 / 156.5) x 100 = 15.98%.

Therefore, the percentage difference between 144 and 169 is approximately 15.98%. This means that the second number (169) is about 15.98% greater than the first number (144).