MA07-05 Maths Coming soon
Error intervals from rounding and truncation
MA07-05
This lesson is coming soon.
In this lesson
Write the error interval of a value rounded or truncated to a stated accuracy as a double inequality, using the correct strict (<) and non-strict (≤) symbols.
What it covers
- Writing lower ≤ x < upper for a value rounded to a stated accuracy
- Choosing which inequality symbol is strict (<) and which is non-strict (≤), and explaining why
- Writing the (different, non-symmetric) error interval for a truncated value
Key words
For: AQA GCSE 8300, Edexcel GCSE 1MA1, Eduqas GCSE C300, OCR GCSE J560
On the specification
| Board | Spec | Statement |
|---|---|---|
| AQA GCSE 8300 | N15 | Round numbers and measures to an appropriate degree of accuracy (eg to a specified number of decimal places or significant figures) |
| Edexcel GCSE 1MA1 | N15 | Round numbers and measures to an appropriate degree of accuracy (e.g. to a specified number of decimal places or significant figures); use inequality notation to specify simple error intervals due to truncation or rounding |
| Eduqas GCSE C300 | FN15 | Round numbers and measures to an appropriate degree of accuracy (e.g. to a specified number of decimal places or significant figures); use inequality notation to specify simple error intervals due to truncation or rounding |
| Eduqas GCSE C300 | HN15 | Round numbers and measures to an appropriate degree of accuracy (e.g. to a specified number of decimal places or significant figures); use inequality notation to specify simple error intervals due to truncation or rounding |
| OCR GCSE J560 | 4.01c | Use inequality notation to write down an error interval for a number or measurement rounded or truncated to a given degree of accuracy. Apply and interpret limits of accuracy. |
For teachers
This GCSE Maths lesson teaches error intervals from rounding and truncation. By the end, students should be able to write the error interval of a value rounded or truncated to a stated accuracy as a double inequality, using the correct strict (＜) and non-strict (≤) symbols. It works through two worked examples and the mistakes examiners report.