How many numbers from 1-1000 end in a 0 or a 5?

There are 100 numbers that end in 0 (10, 20, 30, ..., 1000) and 200 numbers that end in 5 (5, 15, 25, ..., 995). However, numbers that end in both 0 and 5 (multiples of 10) have been counted twice, so we need to subtract these duplicates. There are 100 numbers that end in both 0 and 5 (e.g., 10, 20, ..., 1000), so the total number of numbers that end in 0 or 5 is 100 + 200 - 100 = 200.