Preparation tools: cardboard, scissors, pen
The steps are as follows:
1, prepare a rectangular card.
2. Fold the cardboard in half.
3. Open the cardboard.
4. Draw a heart on the cardboard and a belt on both sides.
5. Cut the photo with a knife, remember not to cut both ends.
6. Fold the crease on the pattern in the opposite direction, so that the pattern will stand up.
7. Then color the heart with a pen and write a math-related message beside it.
You don't have to use cardboard. You can write it directly on paper. The key is the content.
First, you should write some basic concepts, then write a classic example, and then write your own understanding in this respect.
Size? A quarter of A4 paper and several A4 papers are stuck together. Just put a layer of glue on it after it's done.
Let's see what others say. This is an interesting question. I wonder if it has anything to do with mathematics. If it is relevant, I dare not answer it easily. If it doesn't matter, I'll just give you a hint. There must be a summary, I am deeply touched (I care more about the content.