Does the copper abacus need a plate?

A: You don't need plates, you need abacus beads.

Name of each part of the abacus: (1) The border around it is called "frame" (also called "edge"); (2) There is a cross bar in the middle to divide the beads into upper and lower parts. This crossbar is called "beam"; (3) The thin rod passing through the beam is called "gear"; (4) The round bead that passes through the gear is called "abacus bead" (usually also called "abacus bead").

Abacus is an auxiliary tool for manual operation and calculation. It originated in China and has a history of more than 2,600 years. This is an important invention in ancient China. Before Arabic numerals appeared, abacus was a widely used computing tool in the world. Now, abacus continues to be used in parts of Asia and the Middle East, especially in shops, which can be bought from shops that supply goods from China and Japan. In the west, it is sometimes used to help children understand numbers. Some mathematicians like to experience the feeling of calculating simple arithmetic problems with an abacus.