600.
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6.45 is like 645 cents. 45 makes it round down since 100 cents= $1. Rounded, 645 would be 600, or 600 cents. Since 100 cents =$1, 600 cents = $6.
645 rounded to the nearest ten would simply be 650.
640
600
6.45 = 645/100 = 129/20