The child is still twisting his fingers when doing addition and subtraction. What should I do?
It depends on the grade of the child. If the child is going to the first grade of primary school, he still needs a wrench finger. This is a problem that needs the help of parents.
The child is twisting his fingers. On the one hand, he said that children are not sensitive enough to numbers for fear that he might make mistakes. On the other hand, it also needs the help of physical auxiliary computing, and its computing ability is lacking.
The following methods can be adopted:
Remember large numbers in your mind, add and subtract decimals up and down: remember large numbers in your mind, count decimals up, for example, 4+2=, first remember 4 in your mind, count 2 numbers above, 5 and 6, then you will get the answer 6;
For example, 5-2, and then keep 5 in mind, count down to 4 and 3, and you get the answer 3.
Parents need to do more addition and subtraction for their children within 10, and remember not to let their children use wrenches to calculate. Add and subtract within 10 are all correct before adding and subtracting within 20.
2. Rounding method
The rounding method literally means rounding a number to an integer, such as 10, 20, 100 or 120. These are all integers. Then do the calculation, which is more efficient and easier to understand. At the same time, students are also required to master the addition and subtraction of integers and be able to calculate integers quickly.
For example, 8+7=, can you calculate 8+ first? = 10, if the child calculates quickly, he will know that 2 is ok, and then divide 7 by 2 and 5 to quickly calculate 8+7=8+2+5= 15.
3. Split method
Split method, also known as the method of breaking ten, is also a common method in addition and subtraction. In the above example, the splitting method is used to divide 7 into 2 and 5.
Subtraction method is often used, especially when the number of single digits is not enough and subtraction is needed. For example, 15-8=? At this time, the unit number 5-8 is not enough, and 15 needs to be split. At this time, it is necessary to split 15 into 10 and 5, then use 10-8 first, and then the result is +5, that is, 15-8 = 65438.
Split method requires children to exercise more, so that children can realize that there are many ways to split numbers, and it is not necessary to split them into 10+, and any number can be split.