Skip to main content Contents Index Prev Up Next \(\newcommand{\identity}{\mathrm{id}}
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Worksheet Worksheet 2
1. Calculate \(57 - 35\) using a number line.
2. Calculate \(324 - 158\) using a number line.
3. Think about (do not draw) the number line diagram you would need to calculate \(42 - 26\) and compute the result from that mental picture. Do you prefer this visualization or the base-10 blocks visualization? Why?
4. You might be surprised how much a little bit of practice can help to develop your skill and your confidence.
Practice your mental arithmetic by performing the following calculations.
\begin{equation*}
\begin{aligned}
41 - 27 \amp = \\
53 - 38 \amp = \\
39 - 25 \amp = \\
82 - 54 \amp = \\
67 - 48 \amp = \\
43 - 37 \amp = \\
344 - 257 \amp = \\
401 - 235 \amp = \\
518 - 276 \amp =
\end{aligned}
\end{equation*}
