Lesson 1: Rounding and Significant Figures
| Section | Details |
|---|---|
| Objective | Round values to a specified degree of accuracy, including decimal places and significant figures. |
| Activities | – Starter (5 mins): Quick activity – round 5764 to the nearest 10, 100, and 1000. – Main (30 mins): Teach rules for rounding to decimal places and significant figures. Work through examples step by step. Practice estimation by rounding numbers before calculation. – Plenary (5 mins): Students solve 5 mixed rounding problems on mini whiteboards. |
| Resources | Worksheets, PowerPoint with examples, number cards. |
| Time | 40 minutes: 5 (Starter) + 30 (Main) + 5 (Plenary). |
| Homework | Round 20 given numbers to different decimal places and significant figures. |
| Assessment | Worksheet: rounding and estimation tasks. |
| Past Paper Practice | “Write 5764 correct to the nearest thousand.” |
Lesson 2: Estimation in Calculations
| Section | Details |
|---|---|
| Objective | Make estimates for calculations and round answers to a reasonable degree of accuracy. |
| Activities | – Starter (5 mins): Estimate 49 × 21 quickly without calculator. – Main (30 mins): Teach how to round numbers to 1 significant figure before performing operations. Practice estimation problems (e.g., 9.79×0.76541.3\frac{9.79 × 0.765}{41.3}). Discuss when to give answers to a “reasonable degree of accuracy” in context. – Plenary (5 mins): Group challenge – estimate values of 5 mixed problems. |
| Resources | Worksheets, calculator (for checking exact answers), PowerPoint examples. |
| Time | 40 minutes: 5 (Starter) + 30 (Main) + 5 (Plenary). |
| Homework | Solve 10 estimation problems and compare results with actual calculations. |
| Assessment | Worksheet: multi-step estimation problems. |
| Past Paper Practice | “By writing each number correct to 1 significant figure, estimate the value of 9.79×0.76541.3\frac{9.79 × 0.765}{41.3}.” |
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