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*}