-999
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(1 x 4) + (900 x 3) + (90 x 2) + (9 x 1) = 2893
Alternate method of calculating.
000 - 999: 3 * 1000 = 3000
0-99: start with 0, subtract 100: 2900
0-9 start with 00, subtract another 10: 2890
0 -> 1000, add 3 digits. 2893
1,2,3,4 1+2+3+4=10 4 times 3 times 2 times 1 =24 24 counting numbers
Oh, what a delightful question! If we take a look at the numbers from 1 to 99, we'll find that they have a total of 189 digits. Each number from 1 to 9 has one digit, numbers from 10 to 99 have two digits each. Just imagine all those lovely digits coming together to create a beautiful numerical landscape!
10
9
128