I think some people answered your question already, but just wanted to chime in about significant figures...5.12 has 3 sig figs.2.0 has 2 (not 1) sig figs.Answer should be "10." (with the decimal point but no zero behind the decimal point)Remember, the number of digits behind a decimal point always contribute to sig figs. The number of sig figs in an answer is determined by the number with the least number of sig figs in the original equation. The zero(s) in front of the decimal point don't count if the number is an integer, there is no decimal point, and the zero(s) are at the end of the number.

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