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.
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11000
There are 99 numbers between 0 and 100.
0 Look at the product of the first 3 prime numbers: 2 x 3 x 5 = 30. Any number multiplied by 30 will have a 0 in the units digit. So, no matter how many prime numbers you are multiplying, if once you have a number ending in 0, all of the rest will end in 0.
They are all the numbers that end with 5 or 0 except for zero itself.
1100