1. Generally preschool children have not established the concept of number, so addition and subtraction in mathematics are difficult to learn. Children learn addition and subtraction step by step, so teachers and parents should not be too hasty. They can slowly start teaching addition and subtraction in less than 20 years.

2. Children's addition and subtraction skills within 20 years.

Counting is a good addition and subtraction skill, and many teachers think that every child should learn it. But the teacher ignores that many children only start with "1". If you ask him to count from a number in the middle, they may not know how to count. Or children don't know the hop count of integers such as 9- 10, 19-20, 29-30, etc.

And when parents or teachers ask their children to count, addition and subtraction should be taught together, not separately. If they are taught separately, children will eventually learn addition and then subtraction, which is easy to be confused.

In addition, there are skills of division. Write 2, 3, 4, 5, 6, 7, 8 and 9 in order, and then let the children follow, that is, 2 can be divided into 1 and 1, 3 can be divided into 1 and 2, and 3 can be divided into 2 and 1, so that the children can look at the back first. Then let the children discover the rules. The numbers on the left get bigger and the numbers on the right get smaller. Guide children to discover the rules, which makes it easier for them to be interested.

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