How to do addition with an abacus?

Not many people who are online now probably know about this problem. The abacus has been the crystallization of wisdom for nearly 2000 years and has been replaced by modern high-tech products. The addition, subtraction, multiplication and division of the abacus all have oral solutions. I happened to be interested in the abacus for a few days when I was a child. Due to limited conditions, I am only half-introduced to addition. Now I will discuss it with you at my half-hearted level. Now, the specific operation is like this. First type the number to be added on the abacus, and then add the number to be added by speaking. When adding, add from the ones position upward. Does it feel the same as what you didn’t say? In fact, the abacus is equivalent to a counter for arithmetic. You can intuitively reflect how much you add and how much you subtract. Let’s talk about a method of oral addition practice with the abacus. Start adding from 1, 1+2+3+4+5+6+…+34 (it seems to be added to 34), and the calculated sum should be 666. This is also a way to check whether there are any miscalculations during practice. The oral calculation is as follows: 1, 2, 3, 5 goes to 2, 4 goes to 6, 1, 5, 6 goes up, 5 goes to 1, 7, 8 goes to 2 Go to 1, 9, go to 1, go to 1, 10,...the rest is almost a cycle (if there is no oral judgment, the beads are played directly). Only 4 of the 5 beads under the abacus are used, and one is not used. Try starting from 1 like adding more beads.