• Quick retrieval from earlier learning (Reading tables and line graphs). Students answer on mini whiteboards.
• Show answers together and note who needs support in the main task.

1. Water temperature (°C) → Time to dissolve (s) 2 → 50 20 → 43 6 → 36 8 → 29 25 → 22 What happens to “Time to dissolve (s)” as “Water temperature (°C)” increases? (it stays the same / it decreases / it goes up then down / it increases) → it decreasesPrompt: Read down the second column. Are the numbers getting bigger or smaller?
2. Number of cells → Bulb brightness (lux) 5 → 22 10 → 28 30 → 34 8 → 40 50 → 46 What happens to “Bulb brightness (lux)” as “Number of cells” increases? (it decreases / it stays the same / it goes up then down / it increases) → it increasesPrompt: Read down the second column. Are the numbers getting bigger or smaller?
3. Water temperature (°C) → Time to dissolve (s) 2 → 42 4 → 39 6 → 36 40 → 33 10 → 30 What happens to “Time to dissolve (s)” as “Water temperature (°C)” increases? (it decreases / it increases / it stays the same / it goes up then down) → it decreasesPrompt: Read down the second column. Are the numbers getting bigger or smaller?

• Show a simple experiment with one thing changed and ask what makes it a fair test.
• Share the objective: Repeat readings, means and anomalies. Read the success criteria together.

• Work through the example out loud, saying why you do each step, not just what you do.
• Example: A group measured a pulse rate after exercise three times: 103, 101 and 100 bpm. What is the mean? Give your answer to 1 decimal place.
• Step 1: 103 + 101 + 100 = 304
• Step 2: 304 ÷ 3 = 101.33
• Step 3: So the answer is: 101.3 bpm
• Answer: 101.3 bpm
• Pause after each step and ask a student to say what comes next.

• Do these together. Students try each step on whiteboards before you reveal it.
• Use the hints as prompts rather than giving the answer.

1. A group measured a pulse rate after exercise three times: 107, 105 and 104 bpm. What is the mean? Give your answer to 1 decimal place. → 105.3 bpmPrompt: Add the three readings.
2. Four repeat readings of the time for a ball to roll down a ramp (s): 21, 23, 22, 12. Which reading is anomalous (does not fit the pattern)? (12 / 22 / 23 / 21) → 12Prompt: Most of the readings are close together.

• Students work on the student sheet. Circulate and check the first two answers of every student early.
• Students who finish: write a question of their own for a partner, with the answer.

The 8 questions are on the student sheet below, with answers in the key.

• Two questions on their own. Sort answers into got it / nearly / not yet to plan the next lesson.

1. A group measured how far a toy car travelled three times: 89, 92 and 91 cm. What is the mean? Give your answer to 1 decimal place. → 90.7 cmPrompt: Add the three readings.
2. Four repeat readings of a pulse rate after exercise (bpm): 148, 104, 107, 107. Which reading is anomalous (does not fit the pattern)? (148 / 104 / 107) → 148Prompt: Most of the readings are close together.

Free online practice with hints and printable worksheets for this skill: eurekami.com/science/grade-6.