Checking and securing understanding of percentage decrease
I can decrease an amount by a given percentage.
Checking and securing understanding of percentage decrease
I can decrease an amount by a given percentage.
Lesson details
Key learning points
- In all of these representations a single multiplier can be used to find a percentage decrease.
- Representation can help when you are not using a calculator.
- A multiplier is significantly faster when using a calculator.
- To decrease you are going below the original amount.
Common misconception
When using multipliers, pupils can mistake a decimal for the percentage decrease. e.g. 0.52 is a 52% decrease, rather than recognising a 48% decrease
Reminding students that a decimal multiplier greater than 1 means an increase, and a decimal multiplier less than 1 means a decrease. The latter requires a subtraction from 1 or 100%
Keywords
Proportion - If two things are proportional then the ratio of part to whole is maintained and the multiplicative relationship between parts is also maintained.
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Video
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