Checking by estimating
I can estimate and check if solutions to problems are of the correct magnitude.
Checking by estimating
I can estimate and check if solutions to problems are of the correct magnitude.
Lesson details
Key learning points
- Estimation should give you an idea of the size of an answer.
- It is useful to estimate the answer to calculations so you can check your answers make sense.
- Errors in calculations can be found by using estimates.
Common misconception
When rounding a number, pupils write the first significant digit(s). e.g 36 789 is 4.
The use of the place value table shows the magnitude of the number, thus preserving their place value.
Keywords
Significant figures - Significant figures are the digits in a number that contribute to the accuracy of the number.
Estimate - A quick estimate for a calculation is obtained from using approximate values, often rounded to 1 significant figure.
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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Starter quiz
6 Questions
Exit quiz
6 Questions
9212 -
9000 (1 s.f.)
8934.89 -
8934.9 (1 d.p.)
8910 -
8900 (2 s.f.)
8934.894 -
8934.89 (2 d.p.)
