The Significance and Function of Ten Sum Method
A method of decomposing an addend into two numbers, so that one part of the decomposed addend is added with another addend to get 10, and then the other part of this number is added with 10. This is the way to add ten. Its basic principle is to make the sum of two numbers equal to 10, and then become a calculation method in which the sum of several numbers equals to 10. By adding ten, you can carry the decimal places within 20.
Primary school students' verbal ability is very important. The improvement of children's oral calculation speed can save some learning time, improve learning efficiency, improve children's interest in learning mathematics, and help children build or enhance their confidence in learning mathematics well.