Primary 2 Mathematics

Mom's age: 40-1 39

Mom 3 years ago age: 39-3 36

Xiaohong's age 3 years ago: 13-3 10

3 years ago, my mother's age was Xiaohong: 36 10

You asked"Xiaohong is 13 years old"It seems that it should be "next year" so that it will meet the math requirements of the second grade. ）

Solution: Mom's age this year: 40-1=39 (years).

Mom's age three years ago: 39-3=36 (years).

Xiaohong's age three years ago: 13-3=10 (years).

The relationship between the multiples of the two: 36 10 = multiples without adding units) Comprehensive formula: (40-1-3) (13-3) =

Xiaohong's age 3 years ago (13-3 10 (years)

Mom's age of the year (40-1 39).

Mom's age 3 years ago (39-3 36 (years)

How many times is the age of the mother compared to Xiaohong? （36/10＝

A: Mom's age is twice that of Xiaohong

40-1=39 How old is Xiaohong's mother.

13-3=10 How old was Xiaohong three years ago.

39-3=36 How old was Xiaohong's mother three years ago.

36 10= Mom is twice as big as Little Red.

Mom's age three years ago: 40-(3+1)=36

Xiaohong's age three years ago: 13-3=10

Multiple: 36 10=

Did you learn decimal in 2nd grade?

1. Cultivate self-learning ability, learn to read books under the guidance of the teacher, and preview with the thinking questions carefully designed by the teacher. For example, when studying the example problem on your own, you should find out what the example question is about, what conditions it tells, what it seeks, how it is answered in the book, why it is answered this way, whether there is a new solution, and what are the steps to solve the problem. Grasp these important issues, use your brain to think, go deeper step by step, and learn to use existing knowledge to independently and new knowledge.

2. Summarize the rules of problem solving in a timely manner.

In general, there is a pattern to follow in solving mathematical problems.

When solving problems, you should pay attention to summarizing the rules of problem solving, and after solving each practice problem, you should pay attention to reviewing the following questions:

1) What is the most important feature of this question?

2) What are the basic knowledge and basic graphics used to solve this problem?

3) How do you observe, associate, and transform to achieve transformation?

4) What mathematical ideas and methods are used to solve this problem?

5) Where is the most critical step in solving this problem?

6) Have you done a similar question to this one? What are the similarities and differences in solutions and ideas?

7) How many solutions can you find to this problem? Which of them is optimal? Which solution is a special technique? Can you summarize the circumstances under which it was adopted?

This series of problems runs through all aspects of problem solving, gradually improved, and persevered, children's psychological stability and adaptability to solve problems can be continuously improved, and thinking ability will be exercised and developed.

3. About writing homework.

In the process of homework, there is a mental state of speed-seeking, carelessness and carelessness when reviewing the questions, and for the wrong questions, guide students to form a wrong question analysis method, and the purpose of the analysis is to let students fully realize the problem solving errors caused by incorrect reading, so as to form the internal motivation of "I want to read correctly", and guide students to carefully review the problem and truly understand the meaning of the question.

Mathematics in the second grade of primary school mainly focuses on calculation, and at this stage, it is necessary to exercise children's numeracy ability to lay a good foundation for mathematics at a higher age. Lay the foundation for later math. Computing power must be solid.

What are you talking about in the second grade of elementary school? In the second grade of primary school, mathematics must be carefully mastered in the operation method, and the calculation skills learned should be mastered proficiently, so that it will be skillfully applied!

The knowledge of mathematics in the second grade of primary school is very simple, as long as there is a little knowledge of the parents can be tutored, you can not go to the tutoring institution, parents can tutor, but with the improvement of the grade, the knowledge is becoming more and more difficult, some parents can not tutor, at that time the child must have to go to the tutoring class.

In the second grade of elementary school, mathematics is generally learned to carry addition and abdication subtraction.

In the second grade of elementary school, mathematics is generally learned to carry addition and abdication subtraction. This kind of problem should be noted that the numbers must be aligned. The addition and subtraction of the same number requires the addition and subtraction of the same number to the full ten into one, and borrowing one as ten, which requires students to practice more. If you are proficient, the accuracy rate will go up again.

The second-grade mathematics is still relatively simple, mainly to master the operation of addition and subtraction, but the method taught by this teacher is very critical, which will affect the speed of children's problems in the future.

Mathematics in the second grade of primary school is when children start to calculate, and they learn basic numbers in the first grade.

When you start calculating in the second grade, you can lay the foundation for the future.

The second grade of primary school mathematics is still addition and subtraction, only increased to multiple digits, as long as the first grade of addition and subtraction is learned, the second grade mathematics is no problem, don't worry.

Primary 2 Mathematics Thinking Questions 1, Fill in the numbers according to the rules, (

(2. Think about it and calculate the weight of a watermelon.)

The mathematics in the second grade of primary school is relatively simple, but the children in the second grade are also relatively young, and their reading and comprehension skills are not yet there.

Hello, if you are learning knowledge, the second year is multi-digit addition and subtraction and simple multiplication, mainly in terms of calculation. Therefore, the daily training is also based on calculation, and the multiplication formulas must be memorized to lay the foundation for senior mathematics. Thank you.

Practice calculations more, improve your calculation speed, and do logical thinking problems.

In the second grade of primary school, the focus of mathematics is on the training of numeracy ability and the training of reading problems. Cultivate children's reasoning skills and thoughtful thinking skills.

Mathematics in the second grade of primary school is still the most basic addition, subtraction, multiplication and division operations, which are very simple. Double-check.

Math problems in the second grade of primary school are not very difficult. For children, careful understanding is also required. It also develops the child's intelligence from all aspects.

The best thing is to learn math well, and math should be examined.

Cong Cong has 20 stamps, and after giving him 5 stamps, the two of them have the same number of stamps, so how many stamps are there?

Smart Stamps 5 extra stamps = 2 people have the same number of stamps. From this, 20 + 5 = 25 (sheets), and the stamps of Ming Ming are exactly the same number of stamps as two people + 5 extra stamps, and 25 + 5 = 30 (sheets) can be obtained.

A: Originally, there were 30 stamps.

3020+5 25 That's just as much.

25+5 30 is in return to him is his original.

(1) The rule of 53 is that the first two numbers are added to get the last number.

2) The law of 54, 63, and 72 is that the previous number is added to 9 to get the next number.

(1) The next term is equal to the sum of the previous two terms, i.e. a, b, (a+b), (a+2b), (2a+3b), (3a+5b)...

For this sequence it is 1, 6, 7, 13, 20, 33, 53, (86.)(2) Fill in parentheses

Rule: Each is a multiple of 9.

3 9 = 27 (person).

A: This tour cannot be accommodated.

Xiaojun gave Dali 9, Xiaojun is 9+9 more than Dali, plus 9 more after Xiaojun gave Dali 9, a total of 9+9+9 equals 27.

27 cards of 9 + 9 + 9 = 27

Because Xiaojun sent 9 cards, Xiaojun had 9+9 more cards than Xiaojun, plus Xiaojun sent 9 cards after Xiaojun.

There are also 9 more cards than Dali, so 9+9+9=27 (sheets).

27 Ah. Send 9 18 left At this time, there are 9 more cards than the original, and the small army should be 18 ah!!

9x3=27 (sheets).

Answer: It turns out that Xiaojun has 27 more than Dali.

It's like you have 27 cups and he doesn't, you give him 9, you have 18 left, he has 9, you have 9 more than him.

27 ......

Can I use equations in the second grade of elementary school?

Set up a small army, it turned out that there were x zhang, and there were strong and y zhang.

x-9-9=y+9

y=x-27

X is 27 more than Y.

b denotes the addition of three fives.

a indicates that five threes are added to select a

B should be chosen

3 times 5 means 5 times 3, while 5 times 3 means 3 5s

The above analysis is absolutely correct.

b5*3 means 5 3s multiplied.

3*5 means multiplying 3 5s.