Problem
Adding Integers - You can use tiles to add integers. \[ (-7)+(+2)=-5 \] - You can use a number line to add integers. Subtracting Integers - You can use tiles to subtract integers: $(+3)-(-7)$ We need enough red tiles to take away 7 of them. Model $+3:$ Since there are not enough tiles to take away -7 , add 7 yellow tiles and 7 red tiles. Now take away 7 red tiles. There are 10 yellow tiles left. \[ (+3)-(-7)=+10 \] - You can also subtract by adding the opposite: \[ \begin{aligned} (-5)-(-8) & =(-5)+(+8) \\ & =+3 \end{aligned} \] - You can use a number line to subtract integers.
Solution
Step 1 ：\(-7 + 2 = -5\)
Step 2 ：\(3 - (-7) = 3 + 7 = 10\)
Step 3 ：\(-5 - (-8) = -5 + 8 = 3\)
Step 4 ：\boxed{-5, 10, 3}
