The 10-sum method is a common addition calculation method, which is mainly used for first-year students to calculate additions up to 20. The basic principle is to decompose an addition into a combination of two numbers, one of which is added to the other to get ten, and then another number is added by ten.
For example, when calculating 8+5, you can decompose 5 into 2 and 3, and use 8 and 2 to make up 10 first. Then, add 10 to 3 to get 13. Of course, it is also possible to divide 8 into 3 and 5, use 5 and 5 to make ten, and then add 3 with 10 to get 13
When calculating, you need to take ten as an important unit of calculation, decompose the addition into a combination of two numbers, and divide it into two numbers, depending on what number and another number can make up ten. Then add the number that is divided into ten and add another addition to get ten. Then add ten to another number. It's simple, ten plus a few equals a dozen, and it's easier for elementary school students to understand.
The method of making up ten is very practical in mathematics Xi and can help us calculate addition results quickly and accurately. At the same time, it can also help us better understand the nature and laws of addition. By making up the 10 method, we can make complex addition calculations simple and easy to understand, improving our calculation ability and mathematical thinking ability. Mathematics