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Science · Years 3-5
How can I teach children to compare repeated test results?
Compare repeat measurements and avoid generalising beyond the tested conditions.
Download: Dissolving time table
A4 PDF · 2 pages · free · no sign-up
Print page 1 for the activity and keep page 2 for teaching notes, answers or review criteria.
Use A4 paper at 100% or Actual size. Suggested years or grades are selection aids, rather than curriculum alignment claims.
How to use this resource
- Read each trial as a separate measurement before calculating a summary.
- Use the supplied example or task brief. Let the learner respond through writing, drawing, discussion or their usual communication method.
- Review the answers or criteria below. Look for a conclusion that mentions the tested conditions and recognises variation.
What is in the printable?
Invented dissolving times in seconds: Condition A (cool water): 90, 86, 88. Condition B (warm water): 44, 48, 46. Same sample amount, water volume and stirring routine were planned. This is a data task, not a practical instruction.
- Which condition had the shorter time in every recorded trial?
- Find the range of times in A and in B (largest minus smallest).
- Find the mean time for A and B.
- Write a conclusion limited to these results.
- Name one reason repeated trials are more informative than a single trial.
Make it easier or add challenge
More support
Compare the six numbers first; supply a calculator or omit the mean if it distracts from the science focus.
More challenge
Explain how one very unusual result would affect the mean and what you would investigate before discarding it.
What to look for
Look for a conclusion that mentions the tested conditions and recognises variation.
Teacher answers and suggested responses
1. B, warm water.
2. A: 4 seconds; B: 4 seconds.
3. A: 88 seconds; B: 46 seconds.
4. Under these sample conditions, the material dissolved in less time in B across all three trials. Do not claim the data establish what every material would do.
5. Repeats show variation and help identify an unusual result. Any practical follow-up is teacher planned with suitable materials and temperatures.
Further teaching guidance
Related guidance from EP for Schools: How can we make science vocabulary more accessible for pupils with SEND?
Try another activity
Deliver individually or in a small group
Choose one learning aim from this activity. Model one example, work through another together, then give each pupil a turn with a fresh example. In a group, ask everyone to think or show a response before sharing; one confident answer does not show what the whole group understands.
Keep the task’s more-support option available. Allow the usual communication tools, practical materials or drawing where these preserve the learning aim. Reduce the number of examples if needed, rather than rushing through the sheet.
What progress should I look for?
Look for a conclusion that mentions the tested conditions and recognises variation.
Note the example used and whether the response was independent, followed a general prompt or needed a model. Try a different example on a later occasion and look for clearer reasoning or less support on a comparable task. Use these observations to plan the next teaching step.
Printing, access and sharing
Use separate paper or a different recording method when more space or an accessible format is needed. Free to print and copy within your school, setting or family. Retain the website credit and share this teaching page with other settings.