Tens with tens, ones with ones
Hand kids base ten blocks for 46 + 27. They combine the rods, then the cubes, and trade 10 cubes for a new rod. Building regrouping with blocks makes "carry the one" make sense instead of feeling like a magic trick.
Why it works: going from real objects to pictures to symbols is a core recommendation of the U.S. Department of Education's elementary math guide.
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