Tools/raw materials: pencils, A4 white paper.

1. First, we need to find the middle position on the paper and draw a curve in the middle. Then you can draw two arcs on both sides of the box.

Then draw an arc on the west side of this square. Then we use this diagonal to decorate the arc. Then draw a diagonal line on our right.

We also need to draw a relatively symmetrical arc on the box. We can also decorate it with the diagonal line just now, draw two arcs below, decompose, write multiplication and classification.

4. Finally, we write the commutative law of multiplication and the distributive law of multiplication. In the last part, we need to write an exchange law and a distribution law to correspond to our English letters just now.