Year 9 - Maths
Checking a claim
Thinking critically with maths
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Unit Summary
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Lesson Summary
You will learn to analyse a claim using estimation to assess validity.
Key Notes
- Estimation can be used in place of non-specified values.
- Claims should be checked to see whether they make sense.
Vocabulary To Learn
- Probability: The probability that an event will occur is the proportion of times the event is expected to happen in a suitably large experiment.
- Estimate: To estimate is to find a value that is close enough to the right answer, usually with some thought or calculation involved.
Common Mistakes To Avoid
- Taking 20% off an amount after a percentage change will result in the original amount before 20% was added.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Estimation can be used in place of non-specified values. Claims should be checked to see whether they make sense.
2. Use this key word in a maths sentence and explain it clearly. 'Probability'
The probability that an event will occur is the proportion of times the event is expected to happen in a suitably large experiment. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Taking 20% off an amount after a percentage change will result in the original amount before 20% was added. Correction: These are percentages of different amounts so, given that we are calculating 20% in both cases, this will not work.
More Lessons In This Unit
Browse all guides in the Year 9 Maths guide library.