Skip to main content Contents Index Prev Up Next \(\newcommand{\identity}{\mathrm{id}}
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Print
Worksheet Worksheet 2
1. Calculate \(36 + 59\) using a number line.
2. Calculate \(227 + 389\) using a number line.
3. Think about (do not draw) the number line diagram you would need to calculate \(23 + 38\) and compute the result from that mental picture. Do you prefer this visualization or the blocks visualization? Why?
4.
Practice your mental arithmetic by performing the following calculations.
\begin{equation*}
\begin{aligned}
44 + 21 \amp = \\
24 + 68 \amp = \\
46 + 19 \amp = \\
16 + 25 \amp = \\
79 + 26 \amp = \\
34 + 18 \amp = \\
323 + 258 \amp = \\
297 + 197 \amp = \\
186 + 315 \amp =
\end{aligned}
\end{equation*}
You might be surprised how much a little bit of practice can help to develop your skill and your confidence.
