Visual Reference / Measurement / Mass and weight
Measurement
Mass and weight
Balance two masses to compare heavier and lighter, then read a weighing scale in kilograms and grams.
Curriculum rangeYears 1-6
Give each pan its own unit -- comparing 120 g against 0.012 kg takes real conversion, not just reading two numbers.
Left pan
120 g
Right pan
0.012 kg
120 g = 120 g vs 0.012 kg = 12 g
The left pan is heavier, so it drops down.