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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*}