Percentage change with a power relationship

Sample Percentage change with a power relationship questions

A few of the 5 questions, from easier to harder. Choose your exam board and tier to practise them, with every answer marked.

1. Question 13 marksGrade 7
   $y$ is inversely proportional to $x^2$. Find the percentage decrease in $y$ when $x$

What are the common mistakes in Percentage change with a power relationship?

When a pupil makes one of these on Revision Workshop, the marking engine names the mistake and explains it, instead of just marking the answer wrong.

• Assumed percentage change transfers directly

  Assumed the percentage change in $y$ equals the percentage change in $x$, ignoring the squared relationship.

• Doubled percentage instead of squaring multiplier

  Doubled the percentage change (30% × 2 = 60%) instead of squaring the multiplier $(1-0.3)^2$

Quick answers about Percentage change with a power relationship

How many Percentage change with a power relationship practice questions are there?

There are 5 self-marking GCSE and IGCSE Maths questions on Percentage change with a power relationship, written for AQA, Pearson, OCR, Pearson International GCSE Maths A (4MA1) across Higher tier. Each one is marked instantly and has a full worked solution.

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