Predict, test, sort
Give each group a magnet and a tray of objects. Kids predict "yes" or "no" for each one, then test and sort into two piles. Testing their own predictions builds the habit of checking ideas, and the surprises, like a coin that won't stick, spark great talk.
Why it works: kids understand an idea best when they touch it, then draw it, then write it, the order the U.S. Department of Education recommends for elementary math.
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