After early childhood education, it is now suitable for children to learn knowledge. During this period, children have stopped counting …

The question is:

1, can only count to ten.

2. There is no one-to-one correspondence.

These two questions caught my attention. Why do children have this situation? How to guide children through this stage? In order to solve this problem, I began to pay attention to parenting bloggers and collect various practical materials. Of course, the effect of practice is not very ideal, so I began to solve the problem from the source, without receiving fragmented knowledge, and systematically understood how to cultivate children's interest in mathematics.

Cultivating children's awareness of mathematics interest is realized in the book "Mathematics taught by Mom". There are many small methods in the book, which are very suitable for parents of primary schools, because the author of this book is a math teacher. With his experience and some learning experience, parents can feel like parents. Showing wisdom in front of children can really make children admire you more and guide them to learn better.

The following are the math tips in the book.

Everyone knows the formula of 1 inverse multiplication, but it can be displayed with your finger. Isn't it amazing? This method will definitely surprise the wild animals at home! But this is only limited to 9 in multiplication, and other numbers are not applicable.

The method is to stretch out your hands, from left to right. In September, the first finger of your left hand is bent and the rest are nine fingers. Then bend the second finger on the left in the order of 29, leaving one finger on the left and eight fingers on the right, that is 18, 39, 49. You can try, isn't it simple?

This picture is a schematic diagram of four times nine in the book.

This simple skill makes us not only feel the magic of mathematics, but also understand the importance of hands to our mathematics study. Let children use their hands more and observe their hands more, which is of great benefit to their thinking.

2-finger multiplication of the number 8

Take 4 times 8 as an example. If you bend your finger, it is 3 on the left and 2 on the right, so it is 32.

There are two differences between multiplying by 8 and multiplying by 9: the first is to bend one finger or several fingers; The second is to subtract this number from the fingers of the left hand when there are not enough bent fingers.

An example of 7*8? ：

Operation 7 times 8, count to the seventh finger. Then I continue to bend down the seven fingers on the right of the seventh finger. Now I have bent three fingers, so I should bend four more. There are six fingers on the left of the seventh finger, which is 60, MINUS four that should be bent down, which is 60-4=56.

3 Story from 1 to 100

This is the story of Gauss when he was a child, but it is good to test children's induction and summary of numbers with this topic. Parents in primary schools can let their children do it.

4 magic 37

777÷(7+7+7)=37

999÷(9+9+9)=37

888÷(8+8+8)=37

666÷(6+6+6)=37

The fundamental reason why 37 can show this feature is 37×3= 1 1 1. Therefore, the above 999,888,777 ... are only multiples of11,but actually11itself can also be written like this:

1 1 1÷( 1+ 1+ 1)=37

5: the number 9

1×9=9

2×9= 18

3×9=27

4×9=36

5×9=45

6×9=54

7×9=63

8×9=72

9×9=8 1

Except for the rule of 123456, they all add up to 9. The number within 100 is multiplied by 9, and the result adds up to 9.