Place-Value Port
Each place is ten times the place on its right. Zero holds an empty place. Number names and expanded form describe the same quantity.
Before you try
Before you play, make a prediction: What is the value of 7 in 3,742? 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
- Turn the digit wheels to match the blocks, expanded form or number name.
- 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
Each place is ten times the place on its right. Zero holds an empty place. Number names and expanded form describe the same quantity.
4,027 = 4,000 + 20 + 7: four thousand twenty-seven. Turn the digit wheels to match the blocks, expanded form or number name.
A zero is a placeholder. Removing the zero in 5,082 would change the places and the number.
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: Write 5,082 in expanded form and words. The digits mean 5 thousands, 0 hundreds, 8 tens and 2 ones. 5,082 = 5,000 + 80 + 2: five thousand eighty-two.
Check your understanding
Question 1 of 2
What is the value of 7 in 3,742?
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. Turn the digit wheels to match the blocks, expanded form or number name. Ask the child to make a new example using paper, counters, household objects or a labelled sketch.
- Listen to the explanation. A zero is a placeholder. Removing the zero in 5,082 would change the places and the number. Ask “How could we check?” and encourage a second representation of the same idea.