LAUNCH Science · W3L3 · lesson resources
Find the first faulty step
Choose one shared task or resource within the current lesson stage. Keep the lesson’s 40-minute timetable and 15-minute independent work.
We Do · Find the first faulty step
Image length = 32 mm. Actual length = 80 µm.
- Sam writes: 32 ÷ 80 = ×0.4
- Point to the first problem.
- Repair it, keeping the first attempt visible.
Discuss, point, write or dictate your first reason. Use one example first; extend only if there is time.
Reveal shared reasoning after an attempt
The units do not match.
32 mm = 32,000 µm.
M = 32,000 ÷ 80 = ×400.
Check units before arithmetic.
This page keeps your writing while it stays open. It does not save or send it.
Model explanation and diagram
A ruler measurement changes if a picture is resized. A scale bar stays useful if the image and bar are resized together.
Watch for: Do not claim pupils measured a real cell if they used stated lengths or a model. A precise-looking number is not automatically an accurate measurement.
Give a smaller support cue
Check the units first. Then check the calculation. For a scale bar, count how many bar lengths fit the cell image.
Optional video · Microscopy
Watch for: What is the difference between making an image bigger and resolving more detail?
Use a short relevant extract within I Do, then pause for an explanation. The clip replaces part of the modelling time.
Open the freesciencelessons video in a new tab
No-video version · use the same question
Magnification compares image size with actual size. Resolution is the ability to distinguish two close points as separate. Increasing size alone does not reveal more detail.
Internet is needed for the optional clip. It is concept teaching; viewing it is not completion of a practical.