Find the sum : $- 10 + (- 10) + (- 10) + . . . . . . . 10 t i m e s$

$- 100$

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$100$

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zero

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$1000$

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Solution

The correct option is A
$- 100$

$- 10 + (- 10) + (- 10) + . . . . . . . 10 t i m e s = (1 + 1 + 1 . . . . 10 t i m e s) \times (- 10)$
$= 10 \times (- 10) = - 100$
Hence required answer will be $- 100$

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Similar questions

Find the number from each of the following expanded forms:

(a) 8 × 10⁴ + 6 × 10³ + 0 × 10² + 4 × 10¹ + 5 × 10⁰

(b) 4 × 10⁵+ 5 × 10³+ 3 × 10²+ 2 × 10⁰

(d) 9 × 10⁵ + 2 × 10² + 3 × 10¹

Find the sum:

$(- 10) + (- 10) + (- 10) + . . . . . . . 10 times$

Find the sum of the first 10 natural numbers.
(Use $S_{10} = 1 + 2 + 3 + \dots + 10$ and proceed)

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