Regroup out loud
Model a big problem on grid paper, one digit per box. Say each step: "8 plus 6 is 14. Write 4, regroup 1 ten." Lining up digits in boxes prevents the most common mistakes.
Why it works: showing first, practicing together, then letting kids try alone is the "gradual release" model teachers have relied on for decades (Pearson and Gallagher, 1983).
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