For the following, i) use a calculator to subtract; and (ii) round the numbers to the nearest whole number and subtract to obtain an estimate of the true difference. $9.1379$ $\begin{array}{llcc}
\text {$- 1.21159$} & \text { } \
\hline
\end{array}$

Question

For the following, i) use a calculator to subtract; and (ii) round the numbers to the nearest whole number and subtract to obtain an estimate of the true difference. $9.1379$ $\begin{array}{llcc}
  \text {$- 1.21159$} &  \text {  } \
\hline
\end{array}$

Quizplus · Accepted Answer

(i) Subtracting $1.21159$ from $9.1379$ gives $7.92631$. (ii) Rounding $9.1379$ to $9$ and $1.21159$ to $1$, then subtracting $1$ from $9$, gives an estimate of $8$.

For the Following, I) Use a Calculator to Subtract; and (Ii)