First, find the correct correspondence. ( 12)

× 125%+75% ÷ 8 6.4 tons

25% 14× 4 ÷ 65438+8.8 tons 06 8 tons

10÷×××6.4 8 tons or more

×3-×8 tons or more 1.6 tons

7+30% 6×⊙ Yes 14.4 tons is less than 8 tons.

Second, the choice of happiness. (6 points)

1, (+) × 32 =× 32 +× 32 = 28+ 14 = 42, and () is applied here.

A, multiplicative commutative law b, multiplicative associative law c, multiplicative distributive law d, additive associative law

2. It is known that A and B are reciprocal, and the quotient of ? is ().

A, B, C, D and VIII

3, in the following formula, the biggest result is ().

a、2.54÷ B、2.54× C、2.54-

4. The price of a commodity is 60 yuan, which is 20% cheaper than the original price. How much cheaper than the original price? The following formula is correct ().

a、60×20% B、60( 1-20%)C、60( 1-20%)-60

5, a commodity price increase of 25% first, and then reduce the price by 20%, the current price compared with the original price ().

A, raise B, lower C, unchanged

6, 20 grams of sugar dissolved in 80 grams of water, the following statement is wrong ().

A, sugar accounts for b of syrup, the ratio of sugar to water is 1∶4 C, and sugar accounts for 20% of syrup.

Third, the judge.

1, the quotient of number A divided by number B and the quotient of number B divided by number A are reciprocal (neither a nor b). ( )

2、 12÷( + )= 12÷ + 12÷ )…………………………………( )

3.6.4:1.6 The simplest integer ratio is 4. …………………………………( )

4. The degree ratio of the inner angle of a triangle is 3: 2: 5, and this triangle is a right triangle. ……( )

5. If (3,2) is used to indicate the position of the second row of the third column, then

The fourth column in the fifth row is represented by (5, 4). ……( )

6. The perimeter and area of the shaded part and the blank part in the figure are equal.

Equal. …………………………………( )

Fourth, fill in, I can do it. (2 points for each question, ***20 points)

1, () is 18 tons, and the number above 28 is ().

2. Hours = () minutes 1 hour 50 minutes = ()

There are fewer boys than girls in Class 3.6 (1). Describe the relationship between boys and girls in different ways: ().

Fill in the appropriate figures in brackets, so that each problem can be calculated by a simple method.

10― ―( ) ( + )×( )

× ×( ) ÷( )+ ×

5.A =, B is the reciprocal of A, and A is ()% of B.

6. The shaded part in the figure accounts for 2 tons, which is () tons.

7. Cut a 24 cm long iron wire into three sections on average, one is square, the other is rectangular and the other is round. Among them, () has the largest area and () has the smallest area.

8. If 20% of A and B are equal, then the simplest integer ratio of A and B is (): ().

9. The ratio of A number to B number is 3∶5, B number is more than A number 12, A number is (), and B number is ().

10, the number of students in a class shall not exceed 50. If there are excellent students in a physical education class, then () people will fail.

5. calculation. (18)

1, how to calculate as simple as possible.

( 1) + + + × 10 (2) ÷[ -( + )

(3)9×( + )+ (4) 128×

2. Solve the equation. (4 points)

( 1) χ- ÷ = (2) χ-40%χ=

3. Column calculation. (6 points)

(1) 75% of a number is, what is the multiple of this number?

(2) The number A is 2 more than the number B 12.5%, and the number A is 30, so find the number B. ..

6. Operation and calculation. (16)

1, fill it out and draw a picture. (10)

(1) Translate the triangle ABC to the right by 6 squares, and write the translated triangle A ′ b ′ c ′ with several pairs.

The positions of the three vertices. (3 points)

a′(，)B′(，)C′(，)

(2) Rotate triangle ABC clockwise around point C for three times, 90 degrees each time. Draw the first one first.

The graphics after the second rotation, and then draw the graphics after the second and third rotation respectively. (3 points)

(3) A 1, A2, A3 respectively represent the rotated position of point A, and they are represented by number pairs. (3 points)

A 1(，)A2(，)A3(，)

(4) Connect A, A 1, A2 and A3 in turn, and the graph obtained is (). ( 1)

2. Draw a smallest circle through point A and point B, measure relevant data, and calculate the area and perimeter of this circle. (6 points)

Seven, application questions. (22 points)

1, Fenfen, Fangfang and Feifei counted the number of times they got "excellent" in math homework this semester, and they exchanged statistical results. (4 points)

Fenfen said, "I got 48 straight A's." Fangfang thought for a moment and said, "You are really good! More than me. "

Feifei thought about it and said, "Anyway, I am less than Fangfang once."

Please count how many times Feifei got an "A" in her math homework according to the dialogue between three people.

Two barrels of water weigh 54 kilograms. If 0.5kg is poured from the first barrel to the second barrel, the weight ratio of the first barrel to the second barrel is 4: 5. How many kilograms are there in these two barrels of water? (5 points)

3. The existing oil 100kg, * * * contains 32 large and small oil pots, 4kg in large pots and 1kg in small pots. Q: How many oil jugs are there? (4 points)

Xiaoli's mother deposited 6000 yuan in the bank regularly for three years. The interest tax rate at that time was 20%. When due, she withdrew the principal and after-tax interest of RMB 6,570.24. What is the annual interest rate for three years? (5 points)

36 students from Class 1, Grade 6 visited the Science and Technology Museum under the leadership of Mr. Wang. When they bought tickets, they found a notice in the window, which read: The retail price of each ticket is 5 yuan, and more than 40 people can buy group tickets, and group tickets can be sold at a 20% discount; More than 30 people can get 3 tickets. Think about it, how can they buy tickets economically?

(4 points)