Highest is 9999, lowest is 1000. These and everything between them have four digits.
Try subtracting 999 from 9999. If you can´t, there´s always wikianswers.
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The numbers from 1000 to 9999 are all 4 digits, as are -1000 to -9999. Therefore there are 18,000 four-digit numbers in all.
The numbers from 1000 to 9999 are all 4 digits, as are -1000 to -9999. Therefore there are 18,000 four-digit numbers in all.
All digits are significant except zeros closest to the decimal place. Thus, the 2300 at the end are all significant, giving four significant digits
All four of them
There are 5 numbers of 1 digit, 25 numbers of 2 digits, and 75 numbers of 3 digits. This makes 105 numbers in all.