Make all kinds of things with rectangular paper.

1. Frog jumping when folding rectangular cardboard.

First fold a herringbone into a triangle, then fold the four corners inward and outward, turn it over and fold the back, and fold it in half at the bottom.

2, rectangular cardboard folding gold ingot

Two-thirds discount. After unfolding, the two corners are folded inward and the other side is folded upward. It's done.

3, rectangular cardboard folding cow envelope

Fold it in half twice, cut off the extra parts, take out a rectangle, draw your favorite pattern, glue the bottom firmly, and do it.