The first step is to find a piece of A4 paper, fold the short side of the paper in half, then fold it in half, fold the long side in half, and then open the folded paper just in half.

Step 2: Divide four equal parts according to the method of folding in half in the previous step, then tear the middle vertically by hand, then open A4 paper, fold the long side in half, leaving the torn side in the middle. Hold both ends of the found A4 paper with both hands and push it to the middle.

Step 2: Divide four equal parts according to the method of folding in half in the previous step, then tear the middle vertically by hand, then open A4 paper, fold the long side in half, leaving the torn side in the middle. Hold both ends of the found A4 paper with both hands and push it to the middle.

Step four, draw some beautiful pictures on the finished book. Interesting pictures, writing meaningful math problems in a notebook, and preferably adding some short stories. Finally, put these in order and the picture book will be ready.