Question

Which expression will produce an answer with the fewest significant figures?A. 15.4 - 8.1B. 4350 - 2210C. 18.8 - 6.5D. 54.5 * 30.7

Answer 1

we have following:

$\begin{gathered} 15.4-8.1=7.3\cong7\rightarrow2sf \\ 4350-2210=2140\rightarrow3sf \\ 18.8-6.5=12.3\cong12\rightarrow3sf \\ 54.5\cdot30.7​=1673.15\cong1670\rightarrow3sf \end{gathered}$

therfore, the answer is the option A.