The ten-point method is explained as follows:
To calculate skillfully, you must first know the number of good friends. Which two numbers in a single digit add up to 10? 1 and 9,2 and 8,3 and 7,4 and 6,5 and 5. These five logarithms add up to 10, which we call the number of good friends. By using the method of supplementing ten, the carry addition within 20 is transformed into the familiar problem of 10 plus several, thus simplifying the complex and making simple calculations.
For example, 9+6 is calculated by the method of ten. Solution: Divide 6 into 1 and 5, because 9 adds up to 10, and lacks 1, so divide 1 into 9+6, decompose and calculate 9+ 1= 10, and finally/kloc-.
Ten-point method
The ten-by-ten method is to decompose an addend into the sum of two numbers, so that a part of the decomposition and another addend are added to get 10. By using the method of filling ten, the carry addition within 20 can be transformed into the problem of adding several words to 10, which is familiar to children, and it embodies the transformation idea in mathematics, thus making it difficult and easy. It can not only improve the accuracy of calculation, but also effectively improve the speed of calculation.
It is of great help to children's future study. The method of adding ten is a very practical and simple algorithm when adding within 20, and the number of good friends should be clear. Ten addition is to divide one addend into several parts, so that the sum of the divided number and the other addend is exactly 10 (that is, the number of good friends is holding hands). This is the ten sum method.