\text { Add } 3.6 \times 10^{-3} \text { and } 9.1 \times 10^{-3} \text {. }
Question 4.1: Add 3.6 * 10^-3 and 9.1 * 10^-3
\begin{array}{r}3.6 \times 10^{-3} \\+9.1 \times 10^{-3} \\\hline 12.7 \times 10^{-3}\end{array}
The answer could also be written in other, equally valid ways:
12.7 \times 10^{-3}=0.0127=1.27 \times 10^{-2}
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