MA07-02 Maths Coming soon
Estimating a calculation by rounding
MA07-02
This lesson is coming soon.
In this lesson
Estimate the result of a calculation by rounding every value to 1 significant figure before calculating, using the ≈ symbol to show the method.
What it covers
- Rounding every value in a calculation to 1 significant figure (or the accuracy stated) before calculating
- Using the ≈ symbol to show an estimated result
- Estimating multiplications, divisions and calculations involving roots
Key words
For: Cambridge IGCSE 0580, Edexcel IGCSE 4MA1, OCR GCSE J560, AQA GCSE 8300, Edexcel GCSE 1MA1, Eduqas GCSE C300
On the specification
| Board | Spec | Statement |
|---|---|---|
| Cambridge IGCSE 0580 | C1.9 | Round values to a specified degree of accuracy. |
| Cambridge IGCSE 0580 | E1.9 | Round values to a specified degree of accuracy. |
| Edexcel IGCSE 4MA1 | F1.8D | Use estimation to evaluate approximations to numerical calculations |
| OCR GCSE J560 | 4.01b | Estimate or check, without a calculator, the result of a calculation by using suitable approximations. |
| AQA GCSE 8300 | N14 | Estimate answers |
| Edexcel GCSE 1MA1 | N14 | Estimate answers; check calculations using approximation and estimation, including answers obtained using technology |
| Eduqas GCSE C300 | FN14 | Estimate answers; check calculations using approximation and estimation, including answers obtained using technology |
| Eduqas GCSE C300 | HN14 | Estimate answers; check calculations using approximation and estimation, including answers obtained using technology |
For teachers
This GCSE Maths lesson teaches estimating a calculation by rounding. By the end, students should be able to estimate the result of a calculation by rounding every value to 1 significant figure before calculating, using the ≈ symbol to show the method. It works through three worked examples and the mistakes examiners report.