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Question 2.8: Subtract 120 from 1587.

Subtract 120 from 1587.

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158−12701467\begin{array}{r|c} \begin{matrix}& 158 \\ -& 12 \end{matrix} & \begin{matrix} \\7 \\0 \\& \end{matrix} \\ \hline \begin{matrix} 146\end{matrix} & \begin{matrix} 7\end{matrix} \end{array}

120 is the number with the least precision. The zero is not considered significant; therefore the answer must be rounded to the nearest ten: 1470 or 1.47 ×103\times 10^3

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