10,000 of them, from 0000 to 9999.
However, most people would not count numbers with leading 0s, so that there would be 9000 4-digit numbers.
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24 of them.
3 digit numbers are lessthan 4 digit numbers
1344
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.