More Lessons for A Level Maths

Math Worksheets

Videos, activities, solutions and worksheets that are suitable for A Level Maths. How to prove the formula for the sum of the first n terms of a geometric series? How to prove the formula for the sum to infinity of a geometric series? How to solve word problems using geometric series?

Geometric Series - Proof of the Sum of the first n terms

In this video you are shown how to prove the formula for the sum of the first n terms of a geometric series.

In this video you are shown how to prove the formula for the sum to infinity of a geometric series

In this video we show you how to answer the following problem. A savings scheme is offering a rate of interest of 3.5% per annum for the lifetime of the plan. Alan wants to save up £20,000. He works out that he can afford to save £500 every year, which he will deposit on 1st January. If interest is paid on 31st December, how many years will it be before he has saved up his £20,000?

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You can use the free Mathway widget below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.