This file is divided into three equal parts.
In the left part, the text  2 × 4  is written in black. Below, there is a black number line partially graduated from -8 to 8. The first red arc shaped arrow jumps from 1 to 4. Above it is the text  1 × 4 . An identical arrow jumps from 4 to 8, and the text  2 × 4  is written above.
In the middle part, the text  2 × (-4)  is written in black, except for the negative sign, which is blue. Below, there is a black number line partially graduated from -8 to 8. The first blue arc shaped arrow jumps from 1 to -4. Above it is the text  1 × (-4) . An identical arrow jumps from -4 to -8, and the text 2 × (-4)  is written above.

In the right part, the text  -2 × (-4)  is written in black, except for the negative sign of -2, which is green, and that of -4, which is blue. Below, there is a black number line partially graduated from -8 to 8. The first blue arc shaped arrow jumps from 1 to -4. Above it is the text  1 × (-4) . An identical arrow jumps from -4 to -8, and the text  2 × (-4)  is written above. A third green arrow dives from -8  to 8.
Own work
TealComet