Bundle Pencil
Ten ones can be regrouped as one ten without changing the quantity. A grouping outline makes that trade visible.
Before you try
Before you play, make a prediction: How many ones make one ten? 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 4: Thousands Around Us, pages 39–61).
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Try these ideas
- Enclose each complete row of ten; leave the loose ones outside.
- 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
Ten ones can be regrouped as one ten without changing the quantity. A grouping outline makes that trade visible.
Twenty-three ones are two tens and three ones. Enclose each complete row of ten; leave the loose ones outside.
Grouping changes the way a quantity is represented, not how many objects there are.
This activity connects to Thousands Around Us, NCERT Class 4 maths, printed pages 39–61. 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: Regroup 34 ones into tens and ones. Enclose three complete groups of ten. Three tens use 30 ones, leaving 4 ones: 34 = 30 + 4.
Check your understanding
Question 1 of 2
How many ones make one ten?
Which is the expanded form of 6,040?
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. Enclose each complete row of ten; leave the loose ones outside. Ask the child to make a new example using paper, counters, household objects or a labelled sketch.
- Listen to the explanation. Grouping changes the way a quantity is represented, not how many objects there are. Ask “How could we check?” and encourage a second representation of the same idea.