# what is the sum of the first 10 whole number?

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- husoskiLv 74 weeks ago
When I learned about the number systems, the whole numbers were {0, 1, 2, 3, ...}, also called "the non-negative integers". If that's the definition used in your class then the sum is:

0 + 1 + 2 + ... + 8 + 9 = 45

You can save time by rearranging the sum:

= 0 + 9 + 1 + 8 + 2 + 7 + 3 + 6 + 4 + 5

= 9 + 9 + 9 + 9 + 9

...where I've added numbers in pairs. That's clearly 5*9 = 45.

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