What is the sum of the counting numbers 1 - 40
2 answers:
Simply it as follows:
1 + 39 = 40
2 + 38 = 40 etc
18 + 22 = 40
19 + 21 = 40
There are 19 of these plus 40 itself . . .therefore 20 of them
20 x 40 = 800
And finally the last number not used, 20
Therefore 800 + 20 = 820
820. there is a shortcut which can be used when adding consecutive numbers regardless of how big it is. it can also be done manually though
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