Sum the numbers and calculate (1) two digits plus or minus two digits. Add and subtract two digits from two digits. Vertical addition and subtraction. Addition and subtraction in two-step calculation.

(2) Table multiplication and table division. A preliminary understanding of multiplication. Multiplication formula. Vertical multiplication. A preliminary understanding of division. Find the quotient by multiplication formula. Vertical division. Division with remainder. Formula for two-step calculation.

(3) How to read and write numbers within 10,000. Count. Hundreds, thousands, tens of thousands. Comparison of reading, writing and size of numbers.

(4) addition and subtraction. Addition and subtraction. Continuous addition and addition check, subtraction and addition check.

(5) Mixed operation. Multiply first, then divide, then add and subtract. Two-step calculation problem. parentheses

Quantity and measurement

Understanding of hours, minutes and seconds.

Understanding and simple calculation of meter, decimeter and centimeter.

Understanding of kilograms (kilograms).

A rudimentary knowledge of geometry

A preliminary understanding of straight lines and line segments. A preliminary understanding of horn. Right angle.

application problem

Application of one-step operation of addition and subtraction. Application of one-step operation of multiplication and division. An easy-to-use problem in two-step calculation.

practical activity

Content closely related to life. For example, what kind of math problems do you think of when you investigate the expenditures of various consumer items this week?

extreme

Error-prone question 1 □ ÷ = 6...5, the minimum value in ○ is (), and then □ is (). When looking for the minimum divisor, some students tend to ignore the law that the remainder is less than the divisor and mistakenly think that the minimum value is 1. In the division calculation with remainder, there is a law that the remainder is less than the divisor, so ○ is greater than 5 and the minimum is 6. At this time □ can be calculated from 6× 6+5 and equal to 4 1.

Exercise □ ÷ 7 = △ ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

Teacher Wang took 48 students in the class to row a boat together. Each ship can accommodate up to 6 people. How many boats should we rent at least?

The main reason for the wrong question is: 1. The condition analysis is not thorough when understanding the meaning of the question; 2. When we use division with remainder to solve practical problems, we don't fully consider the remainder. The understanding of the condition "Mr. Wang leads 48 students in the class to line up together" should be 49 people (including Mr. Wang), and the formula is 49 ÷ 6 = 8 (bars) ... 1 (person). Since there is still 1 person left, let's rent another boat, 8+65438+.

A truck can transport 4 tons of goods at a time, and there are currently 23 tons of goods. How many times can it be shipped at least?

Xiaohong comes home from school, and the west is just around the corner. What is her right, back and left direction?

The main reasons for the mistakes in this question are the lack of existing knowledge and experience, the unclear understanding of the four directions of east, south, west and north, and the unclear relationship between these four directions. First of all, according to the fact that the sun rises in the east, it is clear that when facing the east in life, the front is the east, the back is the west, the left is the north and the right is the south. Then when facing the west, the direction should be relative, the east is the west, and the south is the north. Secondly, you can remember them in the order of clockwise east, south, west and north. Correct answer: Xiaohong's front is the west, the back is the east, the left is the south, and the right is the north.

Practice standing north, () in front, () in the back, () in the left, () in the right.