Lowest four-digit number: 1000 Highest four-digit number: 9999
A four digit whole number can be found from 1000 to 9999
7000 - 999 ie 6001 four digit numbers
2000.The smallest four-digit number there can be is 1000. So, add 1000 and 1000 to get 2000, then least sum you can get when adding two four-digit numbers.
900 numbers
There are 12 such numbers.
90
625 if numbers can have leading 0s, 500 otherwise.
1023
9,000
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.