Measure Match
Compare quantities of the same kind after converting their units. Kilograms measure mass; litres measure capacity, so they are not interchangeable.
Before you try
Before you play, make a prediction: Which is greater? 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 8: Weigh It, Pour It, pages 115–127).
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Try these ideas
- Choose the comparison sign after expressing both labels in one unit.
- 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
Compare quantities of the same kind after converting their units. Kilograms measure mass; litres measure capacity, so they are not interchangeable.
1 kg 200 g is 1200 g. It is greater than 950 g. Choose the comparison sign after expressing both labels in one unit.
Mass and capacity are different measurements. Never treat a kilogram as automatically equal to a litre.
This activity connects to Weigh It, Pour It, NCERT Class 4 maths, printed pages 115–127. 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: Compare 1 kg 250 g with 1500 g. Convert 1 kg 250 g into 1250 g. 1250 g < 1500 g; the difference is 250 g.
Check your understanding
Question 1 of 2
Which is greater?
A quarter of one litre is…
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. Choose the comparison sign after expressing both labels in one unit. Ask the child to make a new example using paper, counters, household objects or a labelled sketch.
- Listen to the explanation. Mass and capacity are different measurements. Never treat a kilogram as automatically equal to a litre. Ask “How could we check?” and encourage a second representation of the same idea.