Figure 1, pay attention to the arrow: the arrow is the direction, and the arrow+number means to select the left (or right) number and perform the operation.

In the second picture, there are several colors on the left, one is * * *, the other is inside, the other is outside and the other is * * *.

Figure 3, according to the arrow color, add and subtract a few,

Figure 4, first look at the numbers at the bottom of the box, and then look at the numbers on the left, indicating the position of the animals.