Mathematics knowledge points in the first volume of the second grade of primary school
1, no carry addition
(1) Further understand the meaning of addition in specific situations.
(2) Explore and master the calculation method of two-digit plus two-digit (no carry).
(3) Let students feel the connection between addition calculation and daily life, and further improve their problem-solving ability.
2. Carry addition
(1) Further understand the meaning of addition in specific situations.
(2) Explore and master the calculation method of two-digit plus two-digit carry addition, so as to carry out the calculation correctly.
(3) Simple practical problems can be solved by adding two numbers, which further improves the problem-solving ability.
3. Subtraction without abdication
(1) Further understand the significance of subtraction in specific situations.
(2) Explore and master the calculation method of subtracting two digits from two digits (without abdicating).
(3) further cultivate the awareness and ability to ask and solve problems.
4, abdication subtraction
(1) Further understand the significance of subtraction in specific situations.
(2) Explore and master the calculation method of two digits minus two digits, and make a correct calculation.
(3) Simple practical problems can be solved by two-digit subtraction, which further improves the problem-solving ability.
5. Applications of "more than a few" and "less than a few"
(1) Understand the practical problem of "more or less than a certain number" in specific cases.
(2) You can use the operation of learning tools to let students know which quantity they are comparing, and then what changes have taken place, and finally record it with formulas.
(3) The correct formulation can solve the corresponding practical problems.
(4) Thought and method of infiltration statistics.
6. Even increase or decrease
(1) Explore and master the calculation method of addition and subtraction within 100, and further experience the diversity of algorithms.
(2) You can use the addition and subtraction operation within 100 to solve practical problems in life and experience the diversity of problem-solving strategies.
7. Add, subtract and mix
(1) Explore and master the method of adding and subtracting mixed operations within 100, and be proficient in calculation.
(2) Improve the awareness and ability to solve simple practical problems.
8. Estimation of addition and subtraction
(1) Understand the practical significance of addition and subtraction estimation in specific situations.
(2) Master the estimation method of addition and subtraction within 100, and the estimation is correct.
(3) Cultivate estimation consciousness and improve estimation ability.
Practice: I have grown taller.
(1) Consolidate the knowledge and skills of length units and addition and subtraction. (estimation, measurement, calculation)
(2) Let students appreciate the interest and value of mathematics, and improve their estimation ability and hands-on operation ability.
(3) Infiltrate statistical knowledge and feel the happiness of growth.
Knowledge points of division in the second grade math table
Learning point
I. Average score
1, the meaning of average score: divide some projects into several parts, and each part gets the same amount, which is called average score.
2, the average method:
(1) When some articles are divided equally according to the prescribed number of copies, they can be divided into one article or several times until all the articles are finished.
(2) Divide some items into several equal parts. Think about time-sharing: this number can be divided into several such parts.
Second, division.
1. Meaning of the division formula: As long as it is the process of average division, it can be expressed by the division formula.
2. Reading method of division formula: usually read from front to back, ⊙ reading is division, = reading is arithmetic, and other reading methods remain unchanged.
3. Name of each part of the division formula: In the division formula, the number before the division sign is the dividend, the number after the division sign is the divisor, and the number obtained is the quotient.
Third, use the multiplication formula of 2~6 to find the quotient.
1, the method of quotient:
(1) Find the quotient by the average score method.
(2) Use the multiplication formula to find the quotient.
(3) Use the multiplication formula to find the quotient.
2. When you use the multiplication formula to find the quotient, you should multiply the dividend of the divisor.
Fourth, solve the problem.
1, the solution to the average score problem:
Total number/share = number of shares, total number/share = number of shares, dividend = quotient x divisor,
Dividend = quotient × divisor+remainder, divisor = dividend present quotient, factor× factor = product,
One factor = product ÷ another factor
2. The method of solving practical problems by multiplication and division:
(1) The problem to be solved requires finding the total number and calculating by multiplication;
(2) Required questions require finding out the number of copies or the number of copies per copy, and calculating by division.
Knowledge points of "average score" in senior two mathematics
1, the meaning of average score: divide some projects into several parts, and each part gets the same amount, which is called average score.
2, the average method:
(1) When some articles are divided equally according to the prescribed number of copies, they can be divided into one article or several times until all the articles are finished.
(2) Divide some items into several equal parts. Think about time-sharing: this number can be divided into several such parts.
Teaching process:
(A) create a situation and feel the "average score"
(1) The teacher brought you some small gifts today. The teacher wants to give it to you. Please start distributing candy to every student in the group and ask for all the candy. (The number of sweets in each group is different. )
(2) Hands-on operation of each group
(3) Each group reports the situation and the teacher writes it on the blackboard.
(2) Observe the problem
(1) Please observe the results of each group. What did you find?
(2) student observation report.
(3) From the observation, we found that some components have the same amount. Can you give such a division a proper name?
(4) Students name themselves.
(3) Show the theme
(1) The children have good names. In mathematics, we call the same number of points in each part the average score.
Write on the blackboard: average score
(2) Let's talk about which groups are average scores and which groups are not.
(3) What can we do to make the groups that have not been averaged just now?
(4) Students exchange reports.
(Design intention): Let students find the average score independently in the situation of dividing candy. Respect students' learning autonomy and creativity. Teachers guide students to think positively and help students understand the average score through the extension of questions.
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