Junior high school mathematics examination papers and answers

1. Fill in the blank with 0.5 points per bracket, *** 18 points.

1, 40%=8÷( )= 10:( )= (decimal:)

2, 1 km, 20m = () m, 4,3 tons = () tons () kg.

15 minutes at 3 o'clock = () 2 o'clock 07 cubic meters = () cubic decimeter.

3,4,206,500 writing (), rounded to 10,000 places is about () ten thousand.

4. Divide the unit "1" into 7 parts on average, indicating that the number of 5 parts is (), and the decimal unit of this number is ().

The greatest common divisor of 5, 4, 8 and 12 is (); The least common multiple is (), and the prime factor to decompose it is ().

The ratio of 6.0.25: is (), and the simplest integer ratio is ().

7. Among 1, 1.83 and 1.83%, the maximum number is () and the minimum number is ().

8. Among the ten numbers of 1, 2, 3 ... 10, all prime numbers are less than all composite numbers ()%.

9. The timing method at 8: 24 pm is (), and () hours have passed from 7: 30 am to 4: 30 pm.

10, commonly used statistical charts include () statistical chart, () statistical chart and fan-shaped statistical chart.

1 1, the smallest two digits divisible by 2, 3 and 5 is (), and the largest three digits are ().

12 and 6 (1) classes, 48 students passed, 2 failed, the passing rate was (), the excellent rate (over 80 points) reached 60%, and the number of excellent students was ().

13, there are 630 books in the school, which are borrowed at 2:3:4 in grades 3, 4 and 5, and borrowed at grade 5 ().

14. The sum of the sides of the cube is 24 cm. The area of one side of this cube is () square centimeters and the volume is () cubic centimeters.

15. The diameter of the bottom surface of the cylinder is 4cm, the height is 3cm, the area of the bottom is () cm2, the volume is () cm3, and the volume of a cone with equal bottom and equal height is () cm3.

16 and 20 14 are () (filling year or leap year), and there are () days in the whole year.

Second, it is very important to distinguish right from wrong (mark "√" for the right and "X" for the wrong, * * * * 10)

17, circle. The circumference is proportional to the diameter. ( )

18, the interest group made a germination experiment and soaked 20 seeds. Results 16 class germinated, and the germination rate was 16%. ( )

19. Two disjoint straight lines are parallel lines. ( )

20. Among the 200 countries surveyed by the United Nations, it was found that 65,438+000 countries were short of water, 40 countries were seriously short of water and 40% countries were seriously short of water. ( )

2 1, the radius of the semicircle is r, and the circumference is (π+2) R. ()

Third, the brain and eyes quickly choose (write the correct answer number in brackets, *** 12 points)

22, in the statistics, to show the change of quantity, () statistics is the best.

A, bar b, fan c, dotted line

23. From 1 to 10, there are () prime numbers.

a、3 B、4 C、5 D、6

The cover area of 24 math textbooks is about ().

A, 30 square centimeters b, 3 square decimeters c, 0, 3 square meters d, 3 decimeters.

25. The picture on the right is the symbol of a five-pointed star, which has a () axis of symmetry.

a、2 B、3 C、4 D、5

26, and () score is equal.

A, there is only one B, only two C's, countless D's, and nothing.

27, two ropes of the same length, the first cut it, the second cut the rice, and the rest ().

A, the length of the first root is b, the length of the second root is c and the same length is d, which is incomparable.

Fourth, the skill of clever calculation is high (***2 1)

28. Make the calculation as simple as possible: (6 points, 3 points for each question)

( - )÷ 0、5×2、5× 12、5×64

29. Find the unknown X: (* *12, 3 points for each question)

2X- =0、5 X+ X=

2:( X - 1)= 0、36:X=:

30. Find the area of the shaded part in the figure below: (3 points) (unit: cm).

Five, skillfully draw a neat picture (***3 points)

3 1. Draw a circle with a circumference of12,56 cm with the point o in the following figure as the center, and then draw two mutually perpendicular radii.

Six, smart and flexible will solve (***36 points,)

32. I bought 900 Jin of rice in our school canteen and ate 180 Jin for six days. At this rate, how many days can I eat the rest? (Answer with proportional knowledge) (3 points)

33. Uncle Li raised 4500 chickens this year, less than the ducks he raised last year 100. How many ducks did he raise in two years? (3 points)

34. Digging a cave takes 20 days for a team and 30 days for a team. How many tasks are left unfinished after two teams dig 10 together? (3 points)

35. Students do exercises. There are 24 people in each row, which can be 10 row. If there are 30 people in each row, how many rows are needed? (3 points)

36. A cuboid fuel tank is 5 centimetres long, 4 centimetres wide and 2 or 5 centimetres high from the inside, and each liter of gasoline weighs 0 or 74 kilograms. How many kilograms of gasoline can this tank hold? (3 points)

37. The distance between A and B is 380 kilometers, and two cars leave the two places at the same time. Car A travels 45 kilometers per hour and car B travels 50 kilometers per hour. How many hours later, two cars met? (3 points)

38. A batch of spare parts was originally planned to be distributed to mentoring for processing at 8: 05. The actual owner handled 1600 pieces, which exceeded 25% of the assigned tasks. The apprentice only completed 60% of the assigned tasks because of something. How many parts did the apprentice actually process? (3 points)

39. In the activity of "Creating a Demonstration Unit of Green Circular Economy", our school plans to dig a new circular pool with a diameter of 6 meters and a depth of 12 decimeter in the biological park.

(1) What is the floor area of this pool? (2 points)

(2) If cement needs to be painted after the pool is repaired, how big is the painting area? (2 points)

40. I was shocked to learn that after the once-in-a-century snowstorm in six southern provinces of China, teachers and students of our school enthusiastically donated money. In the past six years, the number of donations made by girls in a class accounted for more than 40% of the whole class 160 yuan, and the number of donations made by boys was the number of donations made by girls. How much did this class donate to the disaster area? (3 points)

4 1. The school piled a cone-shaped sand with a bottom diameter of 2m and a height of 5m, and filled it into a bunker with a length of 8m and a width of 3m,14m. How thick can it be laid? (3 points)

42. In a sports class, Mr. Chen arranged three sports activities, namely playing table tennis, badminton and football. The percentage of 40 students in Class 6 (2) participating in various activities in the class is shown in the following figure: (5 points)

Please calculate the required data according to the above conditions and draw the histogram of the number of people participating in sports activities in this class.

Test paper answer:

1、20 25 0.4

2、 1.02 4 300 3.25 2070

3、4206500 42 1

4、5/7 1/7

5、4 24 24=2×2×2×3

6、5/ 16 1/7

7、 1.83 1.83%

8、20

9、20 9

10, banded polyline

1 1、30 120