Level the towers
Give groups cube towers of 3, 5 and 7. Kids move cubes from tall towers to short ones until every tower is the same height: 5. Then they compute (3 + 5 + 7) ÷ 3 and see it matches. Hands first makes the formula meaningful.
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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