What is the sum of the whole numbers from 1 through 10?

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Multiple Choice

What is the sum of the whole numbers from 1 through 10?

Explanation:
Consecutive numbers add up neatly when you pair the smallest with the largest. For 1 through 10, pair them as (1+10), (2+9), (3+8), (4+7), (5+6). Each pair sums to 11, and there are five pairs, so the total is 5 × 11 = 55. Another quick way is the sum formula for the first n integers: n(n+1)/2. Here that’s 10 × 11 / 2 = 55. The total must be 55.

Consecutive numbers add up neatly when you pair the smallest with the largest. For 1 through 10, pair them as (1+10), (2+9), (3+8), (4+7), (5+6). Each pair sums to 11, and there are five pairs, so the total is 5 × 11 = 55. Another quick way is the sum formula for the first n integers: n(n+1)/2. Here that’s 10 × 11 / 2 = 55. The total must be 55.

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