Find a piece of A4 paper, fold the short side of the paper in half, then align it and fold it in half, fold it in half on the long side, then open the folded paper and fold it in half. According to the folding in the previous step, it will be divided into four parts, then tear the middle vertically by hand, then open the A4 paper, fold the long side in half, and firmly clamp the two ends of the found A4 paper in the middle.

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.