People's Education Edition first-grade mathematics textbook treats the numbers 11-20 as a key chapter. In the eyes of many parents, numbers within 11-20 are not difficult. It is not uncommon for children to be able to count from 1 to 100 in preschool. However, knowing how to count in does not mean that they have truly mastered numbers . The key to is to understand . , understand the principles of decimal counting. So how to teach children well? This article combines the content of Shumeng Online’s mathematical thinking course to give you the following suggestions.
1. Basic preparation
11-20 The key to digital cognition is the cognition of tens and ones. In the teaching materials of the People's Education Press, in order to let children understand tens and single digits, it can be said that it is painstaking and very vivid. , but children’s participation is not high, and they still prefer to explain concepts to children.
here does not recommend . It is not recommended that first introduce the concepts of tens and ones to children. Instead, use children's understanding of 1-10. For items that children often come into contact with in life (building blocks, candies, etc.), uses 10 as the number. A bunch of classified .
Take this example:
Go to the supermarket to buy candy bars for your child (the quantity is, for example, 11), and ask the child to put ten pieces in a pile into his pocket, and put the remaining ones into another pocket.
Then ask the child how many candies he has. At this time, we can guide the child to learn to express like this: "I have 1 piece of candy with 10 pieces of candy, and 1 piece of candy with 1 piece of candy."
Second, tens and ones digits
Through exercises similar to the above examples in life, we can make sure that children have mastered the corresponding language expressions. We can guide children to count the number of their own candies, and write them on paper in the form of charts. As shown in the figure below, let the children think about how we can use to use a simple expression to feedback our quantity. At this time, we need to guide the children, for example, can the numbers in the two tables be combined? What does it mean to be together?
In this way, children can figure out how to write 11 through their own thinking, and give the meaning of this number themselves, and they will naturally understand the meaning of 11.
Recognize the digits
3. Verify the conclusion
In the second step, we help the children give the meaning of the number "11". Next, we need to guide the children to to verify the correctness of the conclusions they have drawn , such as 12, 13 is how forms , what does it mean, etc. Let children use their own conclusions to analyze different numbers.
It should be noted that understands with integers. For example, 10 can be understood as 1 10 and 0 1. Breaking through this level, in fact, children's understanding of 20, 30, etc. is no longer a problem.
People's Education Edition content
4. Apply numbers
It is not important to learn numbers. What is important is to use numbers to solve problems . Common application methods are as follows. Parents should make more use of life scenes or mathematical games to let their children Practice:
1, cardinal numbers : that is, cardinal numbers. Use different items to let children count, such as building blocks, fruits, etc.
2, ordinal : There are often some queuing scenes in life, such as queuing at the supermarket checkout, queuing to buy tickets at an amusement park, which floor the house is on, etc. Let your children count more, and it can also exercise queue thinking.
3, compare sizes : Let children learn to compare the sizes of numbers and find the patterns among them, such as which one is bigger between 11 and 9, and which one is bigger between 11 and 19. Let the children find the pattern: first compare the tens digits, and then compare the single digits. If the child does not understand, we continue to demonstrate with objects until the child understands.
4, addition and subtraction : For addition and subtraction calculations, it is recommended to do some simple ones first, such as 12+2, 15-3, etc. When adding and subtracting calculations, you only need single-digit numbers to complete. Lay a solid foundation for children to learn and the subsequent "Ten Methods to Make Up" and "Ten Methods to Break Up" . Summary of
: The numbers of
11-20 are not complicated and can be learned quickly by relying on memory. However, if children do not think through it, it will be difficult to establish mathematical thinking methods. does not understand the principle of decimal counting. will learn larger numbers in the future. When it comes to related knowledge such as time conversion, RMB conversion, etc., will be very difficult for .Therefore, it is very important to let children think in through experience . We try not to give children answers, but give appropriate guidance so that children will have a solid foundation.
