1, and can count down from "1" skillfully.

2. Be able to count skillfully from a certain number in the middle. For example, the teacher said: count from 4; Count from 12.

3. Be able to count down from a certain number in the middle skillfully. Example: The teacher said: Count down from 4, and count down from 12.

Counting is the earliest thing children learn, and we think every child should know it. However, we ignore that many children only start counting from "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 how to jump out of integers like 9- 10, 19-20, 29-30.

Second, let children master the relationship between numbers.

For example, what is in front of 5? What's behind? 8 What's ahead? What's behind? Count forward from 5, count backward, count forward from 1 1, count backward.

Third, let children master the relationship between numbers.

For example, which is bigger, 7 or 8? 12 or 4, which is bigger?

Fourth, let children learn to read questions.

Many children can read the questions, but they can't understand them. Children know the ways of "+"and "-",but they don't know how to read them. Let the children read it out and do the next calculation. Tell them to count backwards when they read "add". When you read "minus", you count forward.

Fifth, teach children to know one and ten.

Let the children skillfully say which of the two digits and which of the ten digits.

For example: 15, the unit is 5, and the decimal number is 1.

Sixth, teach children to calculate.

add

For example, 15+2= We tell our children to keep the big number 15 in mind, and use your fingers to indicate the small number 2 (let the children put their fingers out) with a "+"sign in the middle, that is, count your fingers from the number after 15, followed by 16.

subtraction

For example: 15-2= We tell our children to keep the big number 15 in mind, use your fingers to indicate the small number 2 (let the children put their fingers out), and there is a "-"in the middle, which means counting down from the previous number 15, and the previous number 14.

Addition and subtraction of two tens

add

For example: 15+2= We tell children that the sum of one digit is 5+2=7, and the sum of ten digits is 1, so 15+2= 179.

subtraction

For example: 15-2=, we tell children that the subtraction of one digit is 5-2=3, and the subtraction of ten digits is 1-0= 1, so 15-2= 13.

Relatively speaking, "counting fingers" only applies to the addition formula in which one of the two numbers is singular, because if both numbers are even, then there are not enough fingers; Although "addition and subtraction of numbers" is difficult to learn, it is applicable to all formulas. From the perspective of sustainable development, I suggest "addition and subtraction of numbers"

Addition and subtraction within 20

Add the numbers within 1.20:

1, if you want to master the addition of numbers within 20, you must master the addition of numbers within 10, that is, the addition without carry. For example, 5+4=9, 6+2=8 and so on. In particular, remember two numbers that add up to 10, such as 5+5= 10, 6+4= 10, etc. (Addition and subtraction within 10 is the basis of addition and subtraction within 20, so parents must help their children master addition and subtraction within 10 at home. This foundation is based on the score of 2- 10, so parents can let their children explore and master with a stick of 10, so that their understanding will be deeper, after all, through their own practice.

2. When carrying out carry addition, you can use the method of counting or starting counting. If 8+5=, you can calculate the five numbers after 8, 9, 10,1,12, 13. So 8+5= 13 (this is the beginning, and this method will not be used in the future.

3. The method of "filling ten" is usually adopted. By using the method of filling ten, the carry addition within 20 can be transformed into the familiar problem of 10 plus several, which makes it difficult and easy. It's still 8+5=, so we teach our children, "5 can be divided by 2 and 3, 8+2= 10, when 5 o'clock, 2 leaves, leaving 3, 10+3 = 13, so this question is equal to 13." (Some things that children need to remember when learning: The first thing to remember is that 10 plus a few equals 10, such as10+1=1kloc-0/0+2 =/. The second thing to remember is1+1= 22+2 = 43+3 = 64+4 = 85+5 =106+6 =127+7 =148+.

Second, the subtraction of numbers within 20.

1, first let's see if there are enough digits. If it is enough, we can directly subtract it from the number, for example, 15-4= 1 1, and let the children say, "What I want is to move the number 1 to the equal sign first, and then move it by 5.

2. If the number of digits is not reduced enough, it depends on the reduction of this problem. If you subtract 9 or 8, you can use the method of breaking ten. Subtract the minuend from the minuend's ten digits and then add the minuend's one digit. For example: 12—9=3. (9 and 1 add up to 10, 1 plus 2 equals 3, so this question equals 3. )

3. Regarding the continuous addition and subtraction, even the addition and subtraction within 20, let the children look at the questions first to see if there is anything that can add up to 10. If so, they can add up to 10, and then add and subtract, for example, 8+5+2=, and then they can combine 8 and 2 into 10. Calculate 1 1 plus 1, and the same is true for subtraction. For example, 17-7-2, let the children work out that 17 minus 7 equals 10, and then subtract 2 from 10, so it equals 8. Like 65440. 13 minus 3 equals 10. Of course, the increase or decrease within 20 is only to make children have this awareness, which is not the point. Parents can practice a little.