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To simplify the expression 656.65 using significant figures, we first identify the significant figures in the number. The digits 6, 5, and 6 are all significant, as is the 6 in the hundredths place, giving us a total of five significant figures. If we were to round this number to three significant figures, it would become 657, as the digit following the third significant figure (the second 6) rounds it up.

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