MA13-08 Maths Watch
Sum of an Arithmetic Series
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In this lesson
In this video you'll learn about sum of an arithmetic series for GCSE Maths, with worked examples and the mistakes examiners report. By the end you'll be able to find the sum of the first n terms of an arithmetic series, including setting up and solving the equations (sometimes a quadratic) that arise from sum and term information, and selecting the answer that is valid in context.
What it covers
- 1:09 Sum of an arithmetic series: where the formula comes
- 3:35 Solving for n: the quadratic case
- 7:14 Solving for a and d
- 10:02 Diagnose before you write
- 11:08 Exam technique
- 15:55 What's next
Key words
For: Edexcel IGCSE 4MA1
On the specification
| Board | Spec | Statement |
|---|---|---|
| Edexcel IGCSE 4MA1 | H3.1C | Find the sum of the first n terms of an arithmetic series (Sn) |
For teachers
This GCSE Maths lesson teaches sum of an arithmetic series. By the end, students should be able to find the sum of the first n terms of an arithmetic series, including setting up and solving the equations (sometimes a quadratic) that arise from sum and term information, and selecting the answer that is valid in context. It works through two worked examples and the mistakes examiners report.