The digit 1 appears 301 times, as opposed to 300 for the digits 2 to 9.
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Assuming you mean in the numbers 1, 2, 3, ..., 998, 999, 1000 then the digit 0. (The digit 1 appears 301 times, the digits 2-9 all appear 300 times each, but the digit 0 only appears 192 times.)
1-301 times
When rounding numbers, we typically look at the digit immediately to the right of the rounding digit. In this case, the digit to the right of 9 is 9, which is greater than or equal to 5. When the digit to the right is 5 or greater, we round the rounding digit up by 1. Therefore, 996 is rounded up to 1000.
300
All the numbers between 999 and 3000 are four-digit numbers. You need to subtract 3000 - 999 - 1. The extra -1 is to account for the fact that the numbers 999 and 3000, in this case, are not included.