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  • Subjects
  • Maths CBSE Live product
  • Class 9 (2026-27)
  • Predicting What Comes Next: Exploring Sequences and Progressions

Sum of n natural numbers

Theory

1. Sum of first 'n' natural numbers

Practice Questions

1. Triangular number

Difficulty: easy

1
2. Find 'n'th term

Difficulty: easy

3
3. Sum of first n natural numbers

Difficulty: medium

3
4. Prove the following

Difficulty: medium

6
5. Finding the House Number

Difficulty: hard

5
6. Sum of Natural Numbers Divisible by Two Given Numbers

Difficulty: hard

5
7. Sum of all natural numbers not divisible by 'n'

Difficulty: hard

5

Teacher manual

1. Methodical recommendation
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