Line up the decimal points
Write 0.6 and 0.58 on the board and think aloud: "I line up the decimal points. I can add a zero, so 0.6 is 0.60. Sixty hundredths beats fifty-eight hundredths." Then hand the marker to a student for the next pair. Watching the steps once saves a dozen wrong guesses.
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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