Objective
Model repeated percentage change, growth, decay and compound interest.
Calculator: Non-calculator core; calculator optional only for checking where labelled.
Points route: Connect 2 · Share 2 · Apply 6 · Review 3 · Stretch 2 · Deep Challenge 3. Record your score honestly after you have checked your answer.Recall
Retrieve the key fact or method needed for growth decay and compound interest.
Core practice
£1,000 grows 4% annually for three years. Find final value to the nearest penny.
Reasoning
A price rises 20% then falls 20%. Prove it does not return to the starting price.
Exam-style
Solve an exam-style problem involving growth decay and compound interest. Show working, include a check and interpret your answer.
Recall & Review: feedback and extension integration
Lesson L067: Growth decay and compound interest
Objective: Model repeated percentage change, growth, decay and compound interest.
60-minute structure: 0-7 Connect & Check; 7-14 Share; 14-25 Present/model; 25-44 Apply route choice/practice; 44-52 independent exam-style check; 52-60 Recall & Review, WWW/EBI and next step.
What Went Well (WWW)
I identified the correct reference quantity, ratio, rate or multiplier and kept the units and proportional relationship clear.
Even Better If (EBI)
I will state the whole or reference quantity, show the multiplier or unit-rate step and check whether the result is sensible in context.
Stretch and deep challenge
Stretch: £1,000 grows 4% annually for three years. Find final value to the nearest penny.
Deep challenge: A price rises 20% then falls 20%. Prove it does not return to the starting price.