Sink or Float: Guess and Test

Step by step

1. 1Fill a tub with water, put a towel underneath, and line up 8 to 10 varied objects (cork, spoon, apple, coin, small toy).
2. 2Set the golden rule: "first we guess, then we test." If they try to dunk everything at once, gently smile and say: "hold on, make your bet first!"
3. 3For each item, your child calls out "sink" or "float" and places it on that side of the sheet.
4. 4Drop the object in, watch closely what happens, and move it to the column showing the real result.
5. 5At the end, compare the guesses with the results and look closely at the surprises (the big apple floats, the tiny coin sinks!).
6. 6Ask "why do you think that happened?" and welcome every idea without rushing to give THE answer; test again right away if they have a new theory.

What it builds

Guessing before testing is what turns splashy water play into real scientific thinking. Your child learns to make a prediction, test it out, and be totally fine being wrong—great practice for the big "why" stage.