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3.6 Approximations and Errors
Mathematics · Grade 9 · 4 lessons in the design
What this covers
- Errors from estimations and actual measurements
- Percentage errors
What you will be able to do
- approximate quantities in measurements in different situations
- determine errors using estimations and actual measurements of quantities
- determine percentage errors using actual measurements of quantities
- appreciate approximations and errors in real-life situations
Key questions
“How do we estimate measurements of different quantities?”
Lessons
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Approximating a measurement
40 min · 1 practice tasks · quizEstimate with what you have, measure with a proper instrument, and round to the accuracy the job needs.
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Finding the error
40 min · 1 practice tasks · quizMeasure what you estimated, and the gap between the two is the error.
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Percentage error
40 min · 1 practice tasks · quizDivide the error by the actual measurement and multiply by 100 to see how serious it really was.
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Errors, accuracy and the customer
40 min · 1 practice tasks · quizClose the strand by seeing what a small percentage error costs once it is multiplied or repeated.