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BrainteenAges 14–16MathsWorksheet

Compound interest and depreciation (GCSE-style Foundation)

This is a preview. Print it for the full page.

Show your working. Give exact answers (fractions, surds) unless the question asks you to round; round money to 2 decimal places.

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About this activity

What your child practises

Quick, accurate calculation and recall of number facts, building the fluency harder maths depends on.

What’s included

  • 10 questions
  • An answer key you can print with the sheet or on its own
  • An on-screen version with instant marking and stars

Age and school year

Made for ages 14–16. That’s Grade 9–11 in the US, Year 10–12 in England, JSS 3 – SS 2 in Nigeria and Class 9–11 in India.

How to use it

  • Print it at home or school – it fits a standard A4 or US Letter page.
  • Print the answer key too, so marking takes seconds.
  • Play it on screen: answers are marked instantly and children earn stars.
  • Write on it on a tablet or touchscreen with a finger or stylus – no printer needed.

Tips for parents and teachers

  1. If a question goes wrong, ask your child to show it with fingers, objects or a quick sketch, then try again.
  2. Time one try, then beat it a few days later – children love racing their own best rather than others.
  3. Treat mistakes as information: note what went wrong next to each incorrect answer.

Good to know

Time needed
About 15–25 minutes
You’ll need
A printer (or a tablet to work on screen), a pencil and an eraser
Difficulty
Harder (GCSE-style Foundation) – pitched at ages 14–16
Answer key
Yes – print it with the sheet or on its own

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