None. The sum of one digit can't be twice the size of the digit.
Only one . . . . . 18
10 digits are numbers in the billions.
24.
there are 899 whole numbers that have three digits.
There are 5 numbers of 1 digit, 25 numbers of 2 digits, and 75 numbers of 3 digits. This makes 105 numbers in all.
Only one . . . . . 18
Excluding numbers which begin with 0, there are 67,200 of them.
10 digits are numbers in the billions.
24.
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
5*4*3*2 = 120