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Risadij7
Risadij7 Risadij7
  • 19-05-2015
  • Mathematics
Answered

what is the sum of the counting numbers 1 - 40

Verified Answer :

surekha
surekha surekha
  • 19-05-2015
  1. 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
Answer Link
Trim
Trim Trim
  • 19-05-2015

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

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