Light and Heavy
Identical jars, different contents: hands weigh better than eyes.
Light and Heavy is a Montessori activity for a child aged 4 to 6 years. Area: Sensorial. Time: 15 min.
What the activity builds
Isolate the perception of weight, by holding jars that nothing else sets apart, and build the right words: heavy, light, heavier than. The order checks itself at the end, once the jars are reopened.
The materials
- Five or six small opaque jars, STRICTLY identical, with lids, filled with materials of very different weights: feathers or cotton balls, rice, sand, marbles, salt
- Lids closed tight, with a small discreet mark on the bottom of each jar for your own reference
- A tray, and room to line up the jars
How to do it, step by step
- Set two very contrasting jars in front of your child, the lightest and the heaviest.
- Weigh one in each hand, slowly, eyes closed, then simply say: "heavy," "light."
- Let your child weigh both, as many times as they want, and find which one is heavy.
- Add the other jars one by one, and offer the real work: lining them up from lightest to heaviest, weighing two at a time.
- At the end, open the jars in order along the row: the cotton, then the rice, then the sand... the row tells you if the hands weighed correctly.
The parent's role
Closing the eyes isn't just an extra game: it's what isolates weight, since the eyes cheat. Never correct a misplaced jar during the sorting: opening them at the end will say it better than you can. The vocabulary comes in three periods, as always: this is heavy, show me the heavy one, how is this one? Show once, then step back.
Safety
Tightly closed lids, especially for a jar holding marbles or salt: when in doubt, tape them shut. Weigh the jars seated, over the tray, not standing above bare feet.
You remain the sole judge of what is right for your child. These activities are offered for educational and recreational purposes: they do not replace medical advice or the guidance of an early childhood professional.
Ways to adapt the activity
- Easier: three jars only, with very different weights.
- Harder: six jars with close weights, or finding two jars of matching weight hidden in the series.
- Next step: weighing two household objects by hand and checking on the kitchen scale.
Up next
More activities for a 4 to 6 years child.
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