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Q: How many whole numbers have four or fewer digits?

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18 of them.

you take the four digits and multiply 4 by 4 you get 16 digits

45

It is usually 4 digits. Some banks offer pin numbers that are more than 4 digits long.

Any pair of digits (not including 0), can be used to generate 14 four-digit numbers. If one of the digits is 0, only seven will start with a non-zero digit.

Related questions

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

1234, 2637, 7777, 2727 are examples of a four digit number. So any random four numbers are four digits.

18 of them.

5*5*4*4 = 400

you take the four digits and multiply 4 by 4 you get 16 digits

45

It is usually 4 digits. Some banks offer pin numbers that are more than 4 digits long.

Any pair of digits (not including 0), can be used to generate 14 four-digit numbers. If one of the digits is 0, only seven will start with a non-zero digit.

94

If the digits are all different then 18. Otherwise, 192.

If the last two digits of a number are divisible by four, the whole number is divisible by four.

In representing large numbers, English texts use commas (or spaces) to separate each group of three digits. This is almost always done for numbers of six or more digits, and optionally for five (or even four) digits. This makes it easier to read the number without having to count how many place holders there are in the number as a whole.