Year 8 - Maths
Degrees of accuracy
Estimation and rounding
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit helps pupils understand rounding to different decimal places, and significant figures. Pupils will also learn how to truncate numbers and understand the contexts in which these skills are useful. The unit ends will an exploration of rounding and inequality errors.
Lesson Summary
You will learn to appreciate what is meant by a suitable degree of accuracy.
Key Notes
- When calculating often 3 significant figures is the required degree of accuracy.
- When working with integers in context different degrees of accuracy may be appropriate.
- When working with decimals in context different degrees of accuracy may be appropriate.
Vocabulary To Learn
- Degree of accuracy: A degree of accuracy shows how precise a number or measurement is. E.g. to the nearest cm, nearest 10, 1 s.f., etc
Common Mistakes To Avoid
- Rounding prematurely during multi-step calculations.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
When calculating often 3 significant figures is the required degree of accuracy. When working with integers in context different degrees of accuracy may be appropriate.
2. Use this key word in a maths sentence and explain it clearly. 'Degree of accuracy'
A degree of accuracy shows how precise a number or measurement is. E.g. to the nearest cm, nearest 10, 1 s.f., etc. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Rounding prematurely during multi-step calculations. Correction: Encourage the use of fractions (where possible) or the use of the 'ANS' button.
More Lessons In This Unit
- Checking by estimating Study Guide
- Checking understanding of rounding Study Guide
- Estimating numerical calculations Study Guide
- Inequality notation to express error Study Guide
- Overestimating vs underestimating Study Guide
- Problem solving with estimation and rounding Study Guide
- Rounding decimals to significant figures Study Guide
- Rounding errors Study Guide
- Rounding integers to one significant figure Study Guide
- Rounding integers to significant figures Study Guide
- Rounding to any number of decimal places Study Guide
- Rounding to three decimal places Study Guide
- Securing understanding of rounding Study Guide
- Truncating Study Guide
- Using inequality notation for errors in calculations Study Guide
Browse all guides in the Year 8 Maths guide library.