Do the first one together
Before kids start, solve problem one out loud on the board and narrate your thinking. "I see 4 tens and 3 ones, so that's 43." Then let them try number two while you circulate. Those two minutes save a whole page of repeated 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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