Percentage change and percentage error
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Log in to continueFind increases, decreases and measurement errors using the correct starting value.
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A value of 80 has a 15% increase. What is the new value? Give your answer to 2 decimal places.
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Answer: 92.00
- The multiplier is 23/20: 100% + 15%.
- 80 × 23/20 = 92.00.
- 80 × 23/20 = 92.
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Curriculum reference
Victorian Curriculum F–10 Version 2.0
Pi Leo practice scope
Find increases, decreases and measurement errors using the correct starting value.
Read the official VCAA curriculum description (VC2M8N05)
These quizzes practise concepts within this topic. Multiple-choice answers alone do not demonstrate drawing, conducting an investigation or using a digital tool.
Activities to practise beyond the quiz
- Supported by the guided activity; selecting an MCQ does not demonstrate this action.
- VC2M8N05-C01Calculate percentage increases and decreases.
- VC2M8N05-C02Calculate percentage error using absolute error.
- VC2M8N05-C03Solve percentage change and error problems with and without digital tools, checking the meaning of each result.
- VC2M8N05-C04Find a percentage change from original and new values.
- VC2M8N05-C05Apply and explain percentage change and percentage error using compare evidence and check a claim.
- VC2M8N05-C06Apply and explain percentage change and percentage error using work backwards from what is known.
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Subskills
These practice subskills map to the curriculum topic. Guided activities cover skills beyond multiple-choice questions.
Descriptor-derived subskills
- D01Use a percentage multiplierCalculate percentage increases and decreases.
- D02Compare with the accepted valueCalculate percentage error using absolute error.
- D03Which percentage changed?Find a percentage change from original and new values.
- D04Compare evidence and check a claimApply and explain percentage change and percentage error using compare evidence and check a claim.
- D05Work backwards from what is knownApply and explain percentage change and percentage error using work backwards from what is known.