Children's songs 19 19 were good friends, held hands in 2828, so close in 3737, and walked together in 4646. Make a pair of hands in half. When you see 9, you think of1; When you see 8, you think of 2; When you see 7, you think of 3; When you see 6, you think of 4; When you see a large number, you divide it into decimals, and ten plus the remainder makes ten; Remember large numbers in your mind and decimals in your hand.

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.