Find the sum of numbers from 21 to 30 without actually adding.

355

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455

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255

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155

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Solution

The correct option is C 255

The sum of numbers from 11 to 20 is 155

And the sum of all the numbers from 21 to 30 will be 255

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Similar questions

Find the sum 1 + 3 + 5 + … + 51 (the sum of all odd numbers from 1 to 51) without actually adding them.

1 + 3 + 5 + . . . . . + 51

1

51

Find the sum without actually adding it.

$1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21$

1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21 + 23

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