Mass is easier to reason about when students can compare something familiar with a clear scale reading. Objects, weights and units all need to connect.
The Daily Maths Review mass scale tool gives teachers a screen-based scale tray with classroom objects, gram and kilogram weights, a tray total, unit choices, range settings, example, undo and clear controls.
Start with an object
Before adding weights, ask students to estimate the mass of the object. This gives the scale reading a purpose and helps students decide whether grams or kilograms make more sense.
- Add an object such as a book or water bottle.
- Ask students to estimate whether it is closer to grams or kilograms.
- Add standard weights to build or compare a total.
- Read the tray total and discuss which items make the scale heavier.
Connect grams and kilograms
Switching the display between grams and kilograms helps students see the same mass written in different units, especially once totals move past 1000 g.
Add the school bag, read 2.2 kg, switch to grams, then ask why the same mass is 2200 g.
Move from model to practice
Once students can explain the scale and units, move to measurement practice questions. If they choose the wrong unit or miss the total, return to the mass scale tool and rebuild the tray one item at a time.