Q: How many one-digit numbers are twice the size the sum of their digits?

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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.

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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

There are 5 numbers of 1 digit, 25 numbers of 2 digits, and 75 numbers of 3 digits. This makes 105 numbers in all.

-99

two

99999

how many numbers exactly have 4 digits ? 8900, 8999, 9000, 9999

5*4*3*2 = 120