Classroom objects
Add objects such as an apple, banana, book, water bottle, lunchbox or school bag.
Free maths tool
Mass scale tool
A free classroom mass model for comparing objects, gram weights and kilogram weights on a scale.
Mass weights
Use gram and kilogram weights to build totals and compare with object masses.
Scale readout
Read the tray total and see the scale model update as items are added.
Unit choices
Switch between grams and kilograms and adjust the scale range for different examples.
What the tool does
The mass scale tool gives teachers and students an open scale model for comparing object masses and standard weights.
- add common classroom objects to the scale tray
- add gram and kilogram weights
- read the total mass in grams or kilograms
- change the scale range to suit lighter or heavier examples
- use new example, undo and clear controls for quick modelling
How teachers use it
Open it on a classroom display when students need to connect objects, weights, units and a scale reading before answering measurement questions.
- add one object and ask students to estimate its mass
- build the same total with gram weights and compare the result
- switch to kilograms when the total is over 1000 g
- use the tray list to discuss which objects make the total heavier or lighter
Why it is useful
Mass questions ask students to compare objects, read units and understand the relationship between grams and kilograms. A visible scale makes those ideas easier to discuss.
- supports gram and kilogram vocabulary
- connects classroom objects with numerical mass
- works as a model before independent measurement practice
Frequently Asked Questions
Is the mass scale tool free?
Yes. Teachers, students and families can open the mass scale tool in a browser for free.
Which objects are included?
The tool includes an apple, banana, book, water bottle, lunchbox and school bag, plus separate gram and kilogram weights.
Can it show grams and kilograms?
Yes. The tool can show the tray total in grams or kilograms.
Is this different from the measurement practice app?
Yes. The mass scale tool is an open model for exploring mass, while the measurement practice app gives students practice questions.