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Growth, decay & compound interest — Speed Round

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Resource guide

Key stage

GCSE

Subject

Mathematics

Time

~45 min

Access

Paid subscription

Assessment

Included

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About this resource and curriculum

Study guidance and sample questions

Get the most from this

Try the quiz. Read or listen to each question, take your time and choose your answer. Look at the feedback when you finish, and ask for help with a tricky idea.

This quiz offers short practice. Read or listen to questions with a younger learner where helpful, but give them time to think.

When an attempt is recorded, the dashboard may show its score and time. It does not store a per-question list of mistakes; discuss the on-screen feedback together.

Use this quiz for practice or a check-in. For GCSE, check the relevant DfE subject content and the awarding body's current specification before using this as assessment evidence.

A recorded attempt can show score and time, not a saved list of individual mistakes. Review responses with the learner before choosing a next step.

Use any on-screen review after the quiz to discuss one response and a next step. A saved score or time is not a saved mistake-by-mistake report.

How to study with Growth, decay & compound interest — Speed Round

This parent guide links the page examples with a structured study routine. The listed resource is labelled Mathematics, GCSE, Year 10, Year 11, Quiz. Use that setting, the learning summary and published prompts to clarify what successful work should demonstrate.

Prepare a focused session

Read the title and learning focus together. Ask the learner to recognise the knowledge, terminology or method they may need. Scan each sample and recognise instruction words, amounts, signals, constraints or less familiar terms. Agree a focused time window, reduce distractions and collect useful tools such as paper, pencil, ruler, coloured pens, calculator, headphones or a device. Encourage an self-directed first attempt so the work shows sound understanding and uncertainty. A concise pause often supports recall better than an same-session answer.

Make thinking visible

Invite the learner to restate the task in their own words. They can underline necessary information, separate a complex problem into smaller steps, create a show, sort support, rehearse a sentence or describe a planned method. Ask why their method fits and whether another method could work. When work stops, offer a staged hint: state again the goal, point towards a useful example, narrow the choice, then show only the next step. Return control immediately afterwards. Spoken reasoning highlights confusions and practises specific subject language.

Check accuracy and understanding

Compare the attempt with visible answer guidance after honest effort. Inspect more than the final work: review the method, explanation, units, support, sequence, spelling or presentation where useful. Ask the learner to find the first point where their reasoning changed course. Complete corrections actively in a different colour or fresh space, followed by a concise description of the change. For a correct answer, ask for support and one self-directed check. This differentiates secure knowledge from guessing while building accuracy, reflection and careful working habits.

Consolidate and extend

Finish with retrieval from memory. Cover the example and ask for the central idea, process or fact again. Create one small variation by changing a value, condition, example, viewpoint or level of support while keeping the learning focus. Invite the learner to write a comparable question and supply checking guidance. Record one success and one specific next step, perhaps reviewing terminology, rehearsing a calculation, adding support or improving clarity. Recheck that target again in the week because spaced review gives better information than same-session repetition.

The interactive player, downloadable file and make answer material retain their existing access controls. The guide supports preparation, discussion and review.

Sample questions

Try these questions before opening the interactive quiz. Answers and feedback remain inside the quiz.

£100 grows by 10% in one year. What is the new amount?
What is the multiplier for a 20% increase?
What is the multiplier for a 15% decrease?
For 10% compound interest over 2 years, the multiplier is 1.1². What is 1.1² ?
Work out £200 × 1.1².

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