This key facts covers Key Facts within Compound Interest for GCSE Mathematics. Revise Compound Interest in Ratio & Proportion for GCSE Mathematics with 12 exam-style questions and 4 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 2 of 6 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 2 of 6
Practice
12 questions
Recall
4 flashcards
Key Facts
| Growth Formula | y = a × (1 + r)ⁿ |
| Decay Formula | y = a × (1 - r)ⁿ |
| a = | Initial amount (starting value) |
| r = | Rate as a decimal (e.g., 5% = 0.05) |
| n = | Number of time periods |
| Multiplier | Growth: (1+r), Decay: (1-r) |
Keep building this topic
Read this section alongside the surrounding pages in Compound Interest. That gives you the full topic sequence instead of a single isolated revision point.
Practice Questions for Compound Interest
Which formula correctly calculates the amount A after compound interest at rate r% per year for n years on principal P?
£2,000 is invested for 4 years. - Account A pays 5% simple interest per year. - Account B pays 4.5% compound interest per year. Which account gives more money after 4 years? Show all working.
Quick Recall Flashcards
12 questions on Compound Interest — practise free
Instant marking, adaptive difficulty, and 4 spaced repetition flashcards. Free until your GCSEs.
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