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How many whole numbers are there with not more than 4 digits?

User Galgo
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I think its 1000 numbers because there from 1 to 999 there are 999 numbers, and then you add zero because it is also a whole number. 
User Koti
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A digit is a symbol that is used to write numbers. We use the whole number digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. We can use these digits to write any number.

0, 1, 2, 3, 4, 5, 6, 7, 8 and 9 are one digit numbers.

So total number of one digit number = 10

All the numbers from 10 to 99 are two digit numbers.

So total number of two digit numbers = 90

All the numbers from 100 to 999 are three digit numbers.

So total number of three digit numbers = 900

All the numbers from 1000 to 9999 are four digit numbers.

So total number of four digit numbers = 9 000

whole numbers are there with not more than 4 digits = 10 + 90 + 900 +9000 = 10,000

User Kernelman
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