# How do you calculate 1+2+3+4+5+6+7+8+9+10 quickly?

Home » Puzzles » How do you calculate 1+2+3+4+5+6+7+8+9+10 quickly? ## Puzzle answer: How can you lift an elephant with one hand?

I’ll tell you one trick…which will give you an answer within 1 second…

;

;

just take a calculator… 😉

Ha ha ha…Just kidding!!!

Already there are some brilliant ways people have solved this problem…but I’ll tell you how did I approach when I saw this problem at very first glance…

### Answer : 55

The series “1+2+3+4+5+6+7+8+9+10” can be considered as the sum of the first 10 Natural numbers.

The generalized formula to find the sum of first N natural numbers is

(N * (N + 1) ) /2

For the series given, the value of N is 10

So substituting value of N in the generalized formula

( 10 * (10 + 1) ) / 2

= (10 * 11 ) / 2

= 110/2

Correct answer = 55

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#### also check: If 2+9=711; 14+6=820; 17+11=628; then solve the equation 12+3=???

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