1, through observation activities, experience may stand in different positions to observe objects and show different forms.

2. I can recognize the plane figure seen by the solid from the front, side and top.

Unit 2: Mixed operation of addition and subtraction

1, addition and subtraction are written in the same order, calculated from left to right.

The continuous addition calculation can be calculated by stages or vertically. The calculation method is the same as adding two numbers.

To align the same number, start with a number and add.

Subtraction can be calculated in sections or vertically. The calculation method is the same as subtracting two numbers.

To align the same number of digits, decrease from one digit.

2. Addition and subtraction are mixed, and the operation order and vertical direction are the same as addition and subtraction.

3. In a calculation formula, if there are parentheses, the parentheses must be calculated first.

4. Estimation of addition and subtraction operations: Sometimes in daily life, you don't need to make accurate calculations, you just need to calculate the approximate results. At this time, we need to estimate.

When estimating, estimate this number as the closest 10 number for calculation.

5, problem-solving steps: first look at the question; Write the results horizontally. Don't forget to write the credits. (The unit is as follows.

Or some later words or words; Answer.

6. The application problem of finding the number greater than the number is added, and the application problem of finding the number less than the number is calculated by subtraction (

Meaning: the number that is greatly reduced).

7. Regarding the subject of the question, the following questions can be asked.

, is it * *?

Proportion/what? Proportion/what?

Unit 3: multiplication in table (1).

1, the meaning of multiplication: multiplication is a simple algorithm for finding the sum of several arithmetic operations.

For example, if 2 2 2 = 6 is calculated, the multiplication operation will be 2 3 = 6 or 3 2 = 6.

The left and right numbers of powers are the same, and the addition numbers in the addition formula are the same.

2. Reading multiplication formula: When reading multiplication formula, read it in the order of formula.

For example, 6 3 =18 is pronounced as "6 3 =18".

3. Name of each part of the multiplication formula: In the multiplication formula, the numbers on the left and right sides of the multiplication formula are called "multipliers".

The number after the number is called the product.

4. Meaning expressed by multiplication formula: It is relatively simple to find the sum of several identical addends.

Multiplication expressions represent the sum of several identical addends.

For example, 4 5 means 5 4 addition or 4 5 addition.

5, 2-6 multiplication skills:

The secret of multiplication of 2: one two gets two, and two two gets four.

The secret of multiplication of 3: one three gets three, two three gets six, and three three gets nine.

The secret of 4: 14 is 4, and 24 is 8,3412,446.

) (Fifteen gets five, twenty, thirty-five, forty-five, twenty, fifty-five, twenty-five, twenty-five)

The multiplication formula of 6: 16 gets 6,262,368,4624,5630.

6636

Note: One-on-one.

Unit 4: Angle Recognition

1, the angle has a vertex and two sides.

Red scarf, triangle, clock face and other physical angles are different.

2. The angle has nothing to do with the length of both sides, but only with the size of the openings on both sides.

The more openings on both sides of the angle, the greater the angle. The more openings on both sides of the angle, the smaller the angle.

3. Draw an angle: Draw two sides from one point in different directions with a ruler, which is an angle.

(Please mark the right angle symbol after drawing the right angle))

One of the three angles on a triangle is a right angle.

Square and rectangle have four corners, all of which are right angles.

To know whether an angle is a right angle, please compare it with the right angle on the triangle. Vertex relative to vertex, one side relative to one side, you can see the other side.

6. One of the three angles of a triangle is a right angle.

Square and rectangle have four corners, all of which are right angles.

7. An angle smaller than a right angle is called an acute angle, and an angle larger than a right angle is called an obtuse angle.

Unit 5: Division in Table (1).

1, understand the average score: divide several projects into several parts, and each part is almost the same, which is called the average score.

2, the meaning of division:

(1) Divide several things into several parts, find out how many parts, and calculate by division. Total number of copies = each copy.

) divide a quantity into several parts according to each part and find the average number of parts. If you calculate by division,

Total number of copies = number of copies.

3. How to read the division formula: read from left to right, ""is read as division, "=" is read as equal sign,

Other figures remain unchanged.

For example, 8 2 divided by 8 is read as 4.

4. Names of each part of the distribution formula: in the distribution formula, the number before the divisor is called "dividend"; All numbers after the divisor are called "divisors". The score after the equal sign is called "quotient"

Dividend = quotient.

5, multiplication formula quotient: divided by the formula related to the number.

I think. Divider quotient = dividend.

Unit 6: pictograms and statistical tables

1, and the statistical data methods include: (1) list statistics; ) 2) pictographic statistics) 3) statistical methods for drawing correct words.

2. A grid in the pictographic statistical chart represents a unit. If the figures in the statistics table are anything, a few small squares will be drawn on the pictograph.

3. The word "positive" means writing, and "positive" means quantity 5.

Unit 7: Multiplication and Division in Table (2).

Multiplication skills of 1 and 7-9;

The multiplication formula of 7: 17 yields 7,274,3721,4,728,5735,6742,7749.

The multiplication formula of 8: 18 gets 8,286,3824,4832,5840,6848,

7856, 8864

Multiplication tips:1999,298,3927,4936,59415,6954,79613,8972,9981.

2. "What is the multiple of a number" is calculated by multiplication. A multiple of this number.

For example, what is three times two? The formula is 2 3 = 6.

3. There are several identical addends. Several times this addend.

For example, there are three fives, which is three times that of five.

4. "Find how many times a number is another number", that is, "How many other numbers does a number have", all of them should be divided, and "One number is another number" should be used.

For example, how many times is12 3? The formula is 1) 1 2 3=4.

5. Problems to be solved can be put forward:

Addition problem: Find the total, "Who and who * * * is what? Select the desired family in.

Subtraction problem: comparison.

"Who is more than who? ) )。 How much less than who? .

Division operation problem: if there is a multiple relationship, you can use division operation.

"Who is who several times? Write big numbers before "ha" and small numbers after "ha".

Multiplication problem: whose multiple is it?

Unit 8: Mathematical Wide Angle

1, a set of circular arrangement rules of graphics: the last one is put at the front, and the rest are moved backwards.

Put the front last, and the rest go forward.

2. The changing law of series: arithmetic progression; The sum of the first two numbers is equal to: multiple relation; Every number is the product of two identical coefficients.

2

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