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How much is the sum of the first (40) natural numbers?

Answer and explanation

Correct answer: 820

The sum of the first \(n\) natural numbers is \(\frac{n(n+1)}{2}\). Substituting \(n=40\), we get \(\frac{40\times41}{2}=20\times41=820\). Therefore, 820 is the correct answer. A value such as 800 may result from \(40\times20\), but that is not the correct sum formula. Exam tip: for the sum of consecutive natural numbers from 1 to \(n\), use \(\frac{n(n+1)}{2}\).

Related tags

Natural NumbersSum FormulaArithmetic ProgressionSequences And ProgressionsClass 9 MathematicsSum Of First N Natural NumbersMathematicsClass 9 Mcq

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