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Standard rounding: digits 0–4 round down; 5–9 round up. Banker's rounding (round half to even) reduces cumulative bias in large datasets. Significant figures: count from the first non-zero digit. Example: 0.003456 to 3 sig figs = 0.00346. Rounding errors compound in multi-step calculations—carry extra digits through intermediate steps and round only the final answer.
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