• Quick retrieval from earlier learning (How shadows form when light is blocked). Students answer on mini whiteboards.
• Show answers together and note who needs support in the main task.

1. Which of these is needed to make a shadow? (only a dark room / a mirror and some water / a loud noise / a light source and an object that blocks light) → a light source and an object that blocks lightPrompt: Think of shadow puppets: what do you need?
2. True or false? A shadow shows the outline of an object but not its colours. (True / False) → TruePrompt: What does an object do to light to make a shadow?
3. Shadows: which statement is true? (The shadow of a cup has the shape of a triangle. / Your shadow moves when you move. / Shadows point towards the light. / A shadow shows your face and your eyes.) → Your shadow moves when you move.Prompt: Picture a torch, a toy and a wall.

• Ask the class to make a wave with a rope or slinky and describe what moves and what doesn't.
• Share the objective: Clear, cloudy or blocking? How much light gets through. Read the success criteria together.

• Work through the example out loud, saying why you do each step, not just what you do.
• Example: How much light passes through this: a thick book?
• Step 1: No light passes through opaque materials, so they make dark shadows.
• Step 2: So the answer is: opaque (lets no light through)
• Answer: opaque (lets no light through)
• 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. How much light passes through this: a wooden door? (transparent (lets almost all light through) / translucent (lets some light through) / opaque (lets no light through)) → opaque (lets no light through)Prompt: Hold it up to a window in your mind. Can you see through it?
2. Which of these is opaque? (tissue paper / a clear glass window / a thin cotton sheet / aluminium (aluminum) foil) → aluminium (aluminum) foilPrompt: Think about the shadow each one would make.

• 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. How much light passes through this: a clear plastic bottle? (transparent (lets almost all light through) / translucent (lets some light through) / opaque (lets no light through)) → transparent (lets almost all light through)Prompt: Hold it up to a window in your mind. Can you see through it?
2. A bathroom window needs to let light in but stop people seeing in. Which glass is best? (a mirror facing in / frosted (translucent) glass / a metal sheet / clear (transparent) glass) → frosted (translucent) glassPrompt: It has to do two jobs: let light in and blur the view.

Free online practice with hints and printable worksheets for this skill: eurekami.com/science/grade-1.