What is the method of dozens?

This belongs to the ten-point method.

The method of adding ten is actually a method that makes the calculation easier and faster by using the law that two numbers are combined into 10. For example, 1 and 9 composition 10, 2 and 8 composition 10, 3 and 7 composition 10, 4 and 6 composition 10, 5 and 5 composition 10 and1. Whether it is addition or subtraction, when these laws are skillfully applied to problems, this method can be understood as the method of supplementing ten.

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