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Montessori Activities: Sink/Float


Prep time: 10 minutes

Difficulty: Easy Peasy

Estimated Cost: All home-based objects

Mess level: Medium

What you need

A mixture of items/toys that will either sink or float - eg:

  • Toy bus

  • Feather

  • Rock

  • Shell

  • Wooden spoon

  • Leaf

  • Pegs

  • Seed pod.


Bring the activity from the shelf and organize the material needed. Invite the child to perform the activity and differentiate objects that can sink and float in water. Ask them to sort the objects and put them in their respective containers. Demonstrate the activity slowly and carefully so that the child can see and understand each movement.


This activity enables the child to promote scientific thinking such as cause and effect, observations, comparison, reasoning, data gathering, experimentation, and evaluation.

How to Adapt:

You can print and laminate a simple piece of paper which allows the child to categorize the items.The paper will be split in half (float and sink) and your child has to put them back on the right part of the paper.


Keep a small towel nearby for clean up.

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