Balance Bazaar
Equal masses balance a scale. One kilogram equals 1000 grams; a half kilogram is 500 g and a quarter is 250 g.
Before you try
Before you play, make a prediction: Half a kilogram is… Explain what you expect and what part of the model will help you check it.
Try it out
Interactive activity
Sign in to play
Use a Google account (yours or a parent’s) to unlock this simulator. We store only your name and email so your favourites and progress follow you.
Signing in needs an internet connection. Once you are signed in, simulators also work offline.
Free preview
Loading controls…
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).
Something went wrong
This simulator could not load. Check your connection and try again.
Try these ideas
- Add and remove labelled weights until the beam is level.
- 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
Equal masses balance a scale. One kilogram equals 1000 grams; a half kilogram is 500 g and a quarter is 250 g.
Two 250 g weights balance a 500 g package. Add and remove labelled weights until the beam is level.
The number of weights is not their total mass. Add their labelled masses.
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: Which weights balance a 1 kg parcel? Convert 1 kg to 1000 g. 500 g + 250 g + 250 g = 1000 g, so these three weights balance it.
Check your understanding
Question 1 of 2
Half a kilogram is…
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. Add and remove labelled weights until the beam is level. Ask the child to make a new example using paper, counters, household objects or a labelled sketch.
- Listen to the explanation. The number of weights is not their total mass. Add their labelled masses. Ask “How could we check?” and encourage a second representation of the same idea.