For the numbers 1 - 9 there are 9 × 1 = 9 digits
For the numbers 10 - 99 there are 90 × 2 = 180 digits
For the numbers 100 - 999 there are 900 × 3 = 2,700 digits
For the numbers 1000 - 9999 there are 9000 × 4 = 36,000 digits
For the number 10000 there are 1 × 5 = 5 digits
In total there are 9 + 180 + 2,700 + 36,000 + 5 = 38,894 digits.
10 digits are numbers in the billions.
there are 899 whole numbers that have three digits.
99999
two
There are 5 numbers of 1 digit, 25 numbers of 2 digits, and 75 numbers of 3 digits. This makes 105 numbers in all.
110000
10 digits are numbers in the billions.
there are 899 whole numbers that have three digits.
525
-99
99999
two
There are 5 numbers of 1 digit, 25 numbers of 2 digits, and 75 numbers of 3 digits. This makes 105 numbers in all.
how many numbers exactly have 4 digits ? 8900, 8999, 9000, 9999
There are infinitely many pairs. Two examples are 55000 and 55000, or 100000 and 10000.
3% of 110000 = 3% * 110000 = 0.03 * 110000 = 3300
17 digits