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16000
I count 14 of them.
Sure. Any 1-digit number contains only one-digit numbers as factors. Any larger number, on the other hand, contains itself as a factor, so these can be excluded.
The number 500 contains the digit 5 one time, specifically in the hundreds place. Therefore, there is one occurrence of the digit 5 in the number 500.
90 * * * * * That is clearly incorrect since there are more between 700 and 799. The correct answer is 252.