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Worksheet Worksheet 3

1.
Perform the following calculations using a mental framework of integer chips.
\begin{equation*} \begin{aligned} 3 + 4 \amp = \\ -2 + 8 \amp = \\ -5 + 1 \amp = \\ 2 + (-5) \amp = \\ 8 + (-4) \amp = \\ -3 + (-5) \amp = \\ -4 + 6 \amp = \\ -7 + 7 \amp = \\ 6 + (-4) \amp = \end{aligned} \end{equation*}
2.
Perform the following calculations by rewriting them as addition calculations that can be done with integer chips and then performing the calculation.
\begin{equation*} \begin{aligned} 8 - 4 \amp = \\ 3 - 7 \amp = \\ -2 - 4 \amp = \\ 4 - 9 \amp = \\ -3 - 3 \amp = \\ 7 - 3 \amp = \\ -5 - 3 \amp = \\ 5 - 7 \amp = \\ 5 - 2 \amp = \end{aligned} \end{equation*}
3.
Practice your mental arithmetic by performing the following calculations.
\begin{equation*} \begin{aligned} 21 - 48 \amp = \\ 33 + (-15) \amp = \\ -27 + 59 \amp = \\ -32 + 15 \amp = \\ 29 - (-55) \amp = \\ -18 + (-25) \amp = \\ 11 + (-36) \amp = \\ -42 - (-26) \amp = \\ -42 + 37 \amp = \end{aligned} \end{equation*}
4.
Practice your mental arithmetic by performing the following calculations.
\begin{equation*} \begin{aligned} 218 - 134 \amp = \\ -143 + 237 \amp = \\ -115 + (-283) \amp = \\ 142 - 280 \amp = \\ -248 - (-333) \amp = \\ 272 + (-358) \amp = \end{aligned} \end{equation*}