Number Fireflies
A number sequence follows a stated rule. Work out the difference between neighbouring terms, then use it consistently.
Before you try
Before you play, make a prediction: Complete 15, 20, 25, __. Explain what you expect and what part of the model will help you check it.
Try it out
Interactive activity
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What happened?
Move a control to see what changes and why.
The game practises one idea at a time with simple drawn pictures. Check the same idea with real objects and your NCERT textbook (Chapter 3: Pattern Around Us, pages 34–38).
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Try these ideas
- Try a rising trail and a falling trail, explaining the step each time.
- Try a new puzzle with ↻. Describe what changed and which mathematical rule stayed the same.
- Complete a round, then explain your method before you move to the next one.
Why it works
A number sequence follows a stated rule. Work out the difference between neighbouring terms, then use it consistently.
12, 17, 22, 27 grows by five; the next number is 32. Try a rising trail and a falling trail, explaining the step each time.
Check the rule against every given step. A single pair of numbers may suggest several possible rules.
This activity connects to Pattern Around Us, NCERT Class 4 maths, printed pages 34–38. Use the picture or objects to explain each step before relying on a calculation. The game practises one part of the chapter at a time; the other three activities extend the chapter’s ideas.
Worked example: Find the missing term: 42, 36, __, 24. Each step subtracts 6. 36 − 6 = 30, and 30 − 6 = 24 checks the rule.
Check your understanding
Question 1 of 2
Complete 15, 20, 25, __.
Adding 2 to an odd number gives…
Explain it in your own words
What changed? Why did it happen? Where might you notice this in everyday life?
For parents & teachers
- Try with everyday materials. Try a rising trail and a falling trail, explaining the step each time. Ask the child to make a new example using paper, counters, household objects or a labelled sketch.
- Listen to the explanation. Check the rule against every given step. A single pair of numbers may suggest several possible rules. Ask “How could we check?” and encourage a second representation of the same idea.