Fill in the blanks carefully first (***20 points)

1、0.8 = = 12 ÷( ) = ( ) ∶20 = ( )%

2, the ratio of: 12 to the simplest integer is (), and the ratio is ().

3. Divide the 6-meter-long wire into five sections on average, each section belongs to this wire, and the third section is () meters long.

4, and () are reciprocal, and the reciprocal of 0.4 is ().

5, kg = () grams for 25 minutes = () hours.

3 liters 50 ml = () liters 75 square decimeters = () square meters.

6. () is 20% less than 5, and 5 is 20% more than ().

7. The circumference of a circular desktop is 37 .68 decimeters, the diameter of this circular desktop is () decimeters, and the area is.

() square meters

8. On a certain day, the attendance rate of a class is 96%, and the ratio of absenteeism to attendance is ()

9. Divide a circle into several equal parts and spell it into an approximate rectangle. The circumference of this rectangle is 4 centimeters more than that of this circle. It turns out that the area of this circle is () square centimeters.

10, the sum of the numerator and denominator of a fraction is 67. If the numerator and denominator add 5 respectively, the ratio of numerator and denominator is.

2: 9, the original score was ()

Second, careful analysis (put √ in brackets for the right and × in brackets for the wrong) (5 points)

1, the great circle pi is greater than the small circle pi ()

2. 98 seeds were used in the germination test, all of which germinated, and the germination rate was 98%.

3. The reciprocal of any wrong score is a true score. ( )

4, there is a kind of salt water, salt accounts for the proportion of salt water, the ratio of salt to water is ().

5, to clearly show a patient's temperature changes in a week, you should choose a broken line statistical chart. ( )

Three. Choose carefully (put the serial number of the correct answer in brackets) (5 points)

1, a is a natural number that is not 0, and the smallest number in the following formula is ().

[ ① a ÷ ② a × ③ a × ④ a ÷ ]

2. After one product inspection, there were 0 qualified products 100, 5 defective products and the defective rate ().

[① greater than 5%, ② less than 5%, ③ equal to 5%]

3. A dress goes up by 20% first, and then goes down by 20%, which is the comparison between the current price and the original price ()

[① More than the original price ② as much as less than the original price ③]

4. The total length of a cuboid is 96 cm, the height is 4 cm, and the aspect ratio is 3 ∶2. The volume of this cuboid is ().

[ ① 384 ② 320 ③ 96 ④ 24 ]

5. After adding 10g water and 10g sugar to the sugar water with the sugar content of 10%, the sugar content of the sugar water is ().

【 ① Higher than the original ② Lower than the original ③ equals the original ④ Uncertain 】

Fourth, carefully calculate (the following calculations are the basic calculations you have learned. As long as you are careful, you can do it quickly and well! )

1, the number written directly (4 points)

12 × = 0 ÷ -

4 ÷ 0. 1 % = 5 ÷ =

2. Simplify the ratio and find the ratio (4 points)

75 ∶ 45 0.6 ∶ 2.5

3, solve the equation (4 points)

5 x - 5 × = - =

4, simple calculation (6 points)

24 ×( - ) (

5. Calculation of parting (6 points)

- [ -( - )]×

6, column calculation (8 points)

(1) A number is 8 and less than 23. Find this number (column equation solution).

② The product of subtraction is divided by the difference. What is the quotient?

Verb (abbreviation of verb) answers questions (5 points)

The following is the output statistics of cement plants in four quarters of 2003. Please fill in the blanks according to the statistical chart.

Output Statistics of Cement Plant in 2004

(1) The average output per quarter is () ten thousand tons.

(2) The average monthly output is () ten thousand tons.

(3) The fastest growth of output value was in the first quarter (), which was ()% higher than the previous quarter.

(4), as can be seen from the statistics, the production situation of the cement plant in ().

Six, hands-on operation (4 points)

Draw a circle with a circumference of 12.56 cm, mark the center and radius with letters, and then calculate the area of this circle.

There are many problems in life related to mathematics. Can you solve these problems? I believe you can do it! ) (29 points)

The output value of a chemical fertilizer plant increased by 20% and 5 million yuan this year compared with last year. How much is this year worth?

(2) It takes 8 hours to complete a project, 10 hours to complete, and several hours for both parties to complete the project.

③ There are 42 computer interest groups in a school, with a ratio of 4 ∶3. How many boys are there?

(4) The school canteen burned 2 tons of coal in June, 0.5 tons less than planned. What percentage was saved?

2. A factory used 600 tons of coal in July, saving 20% compared with June. How many tons of coal were used in June? (4 points)

3. It takes 12 hours for Party A to type a manuscript, 15 hours for Party B to type alone, and 15 hours for two people to type together. A few hours later, Party A typed the rest and they played together for a few hours. (4 points)

There is a circular lawn in the school. Its diameter is 30 meters. What is the area of this lawn? If you put a pot of chrysanthemums every 1.57 meters around the lawn, how many pots of chrysanthemums should you prepare? (4 points)

5. Choose a condition you like and fill it in the horizontal line to form an application question and answer it. (4 points)

Xiaohua reads books. On the first day, he finished reading the whole book. The next day, he read 66 pages, _ _ _ _ _ _ _ _ _ _ _

How many pages are there in this book?

(① I don't read page 36 on the first day than on the second; ② The number of pages read accounts for 40% of the book.

③ The ratio of pages read on the first day to pages read on the second day is 5 ∶ 1 1. )

6. Two cars, A and B, set off from A and B at the same time and headed for each other, meeting for 5 hours. After the encounter, the two cars continued to move forward for 2 hours, which is 88% of the whole journey of A car. The distance between B and A is120km. What's the distance between AB and B? (5 points)