Material preparation: A4 paper and pen.
Operating steps:
1. Step 1, find an A4 piece of paper, fold the short side of the paper in half, then fold it in half, and fold the long side in half, and then open the folded paper to just fold it.
2. In the second step, there will be four equal parts according to the method of folding in half in the previous step, then tear the middle vertical bar by hand, then open A4 paper, fold the long side in half, and leave the torn one in the middle. Hold both ends of the found A4 paper with both hands and push it to the middle.
Step 3, push the folded A4 paper to turn it into books and notebooks.
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.