Using inequality notation for errors in calculations
I can use inequality notation $$a ≤ x < b$$ to express errors in calculations.
Using inequality notation for errors in calculations
I can use inequality notation $$a ≤ x < b$$ to express errors in calculations.
Lesson details
Key learning points
- You can use the values of a and b to see what the biggest and smallest answers to a calculation could have been.
- The range of possible answers is the error interval.
Common misconception
When subtracting or dividing, the largest value is found by subtracting or dividing the upper limit of a number by the upper limit of the divisor or additive inverse.
Drawing a number line to show with subtraction will help students see how to achieve an upper or lower limits of an error interval calculation. When using division, reiterating the division of number is the same as multiplying by its reciprocal.
Keywords
Error interval - An error interval for a number $$x$$ shows the range of possible values of $$x$$. It is written as an inequality $$a ≤ x < b$$
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).
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