What is the sum of the first (29) natural numbers?
Answer and explanation
Correct answer: 435
The sum of the first \(n\) natural numbers is \(\frac{n(n+1)}{2}\). For \(n=29\), \(\frac{29\times30}{2}=29\times15=435\). Therefore, 435 is correct. Values such as 425 or 445 can result from an addition or multiplication error. Exam tip: Cancel the factor 2 with the even number first to calculate quickly.
Frequently asked questions
What is the correct answer to this question?
435
Why is this the correct answer?
The sum of the first \(n\) natural numbers is \(\frac{n(n+1)}{2}\). For \(n=29\), \(\frac{29\times30}{2}=29\times15=435\). Therefore, 435 is correct. Values such as 425 or 445 can result from an addition or multiplication error. Exam tip: Cancel the factor 2 with the even number first to calculate quickly.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Sequences and Progressions. Topic: Sum of first n natural numbers.
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