The folding method of Yuanbao is as follows:

1. Prepare rectangular paper.

2. Fold in half.

3. Fold one side down about one-third of the way, and fold the other side in the same direction, aligning the fold lines on both sides.

4. Fold the four corners in half with the middle intersection as the axis, and then turn the upper part down to become a trapezoid.

5. Pull the long sides apart and shape, and the ingot is completed.

Yuanbao is a kind of currency in ancient times, made of precious gold or silver. Generally, silver is the most common and gold is rare. In the history of Chinese currency, gold and silver were officially called "yuanbao" starting in the Yuan Dynasty. However, as early as the beginning of the Tang Dynasty, when Kaiyuan Tongbao came into being, people had the meaning of being large and valuable, and pronounced it as "Kaiyuan Tongbao".

In the Yuan Dynasty, gold and silver coins were called "Yuanbao", which means the treasure of the Yuan Dynasty. Gold is called Jin Yuanbao, and silver ingots are called Silver Yuanbao. This has both political implications and is also a convention on gold and silver currency. general name.

Yuanbao originated in the Tang Dynasty. In the early Tang Dynasty (780~783), there were records of using silver to pay large amounts of horse money (paying large amounts of money to buy horses); it is also confirmed from the unearthed treasures : In the Tang Dynasty, there were silver "cakes" and "collars", that is, the boat-shaped "silver collar" looked like a boat when it was lying on its back and looked like a case (tabletop) when lying down.

The term "silver collar" as "yuanbao" began in the Yuan Dynasty. In the third year of the Yuan Dynasty, the silver from Pinghuaiku (the national bank at that time) was melted into "ingots", and any weight up to 50 yuan was cast into "ingots". , named "Yuanbao", which means "treasure of the Yuan Dynasty".