1. In 1 to 20, * * * has () prime numbers.

2. A fraction, the sum of its numerator and denominator is 38, and the numerator is 28 less than the denominator. This score is ().

3. The circumference of the circle increased from 5π cm to 8πcm, and the radius increased by () cm.

4. Fill a conical container with sand with a bottom area of 9.42cm2 and a height of12cm, then pour it into a cylindrical container with a bottom area of 3.14cm2 and a height of 36cm, and pour it for at least () times before filling it.

5. When drawing, the line segment of 15cm represents the distance of 1200km on the ground, and the scale of drawing this map is ().

6. A factory produced a batch of 250 * * * parts, and 225 of them passed the inspection, and the qualified rate was ().

7. If the tractor plows a field in 3 hours, it will take () hours to plow the field.

8. The proportion of the number of trees planted by the Third Young Pioneers Team is 3: 4: 5. It is known that each team plants 24 trees on average, so the third team plants () trees.

9. In the 4×4 grid shown below, the number of squares is ().

10. At nine o'clock (), the smaller angle between the hour hand and the minute hand is 72? .

Second, the judgment question;

1. All even numbers are composite numbers. ( )

2. The larger the area of the cone bottom, the larger its volume. ( )。

3. In multiplication without zero factor, one factor is constant, and the product is proportional to another factor. ( )。

If the quotient of a divided by b is an integer, we will say that A is definitely divisible by B.. ()

5. If the decimal point of a decimal point is shifted one place to the right, the ratio of the obtained number to the original decimal point is 10: 1. ( )

6. Dissolve 250g of salt in 1kg water, and the salt content of salt water is 25%. ( )

7. If a project is completed in two days, it will take 16 days to complete the whole project. ( )

8. There are only two simplest scores greater than and less than. ( )

Third, multiple-choice questions:

1. The reciprocal of all error scores is. ( )

A. greater than 1b and less than 1.

C. less than or equal to 1 d. greater than or equal to1.

2. Saw a piece of wood with a length of 12 decimeter, a width of 3 decimeters and a height of 3 decimeters into four cubes, and the sum of the surface areas increased ().

9 square decimeter

54 square decimeter 72 square decimeter

3. The product of all the common prime factors of two natural numbers multiplied by their unique prime factors is the () of these two numbers.

A. the greatest common divisor

C. product D. least common multiple

4. A radio is sold at a 10% discount, which means the price is ().

A. 90% of the original price B. 10% of the original price

C. 90% lower than the original price. D. Reduce the price by one ninth.

5. In the figure below, the axis symmetry is ().

A. parallelogram B. isosceles triangle

C. right triangle D. trapezoid

6. If both A and B are numbers greater than 0, 4a=3b. Then ()

A.a is b.a: b = 4: 3.

75% of C.a>b d a is equal to B.

7. If the number of A equals the number of B, then the relationship between the number of A and the number of B is ().

A.A number equals b number. The number a is less than the number B.

C. the number a is not greater than the number B.

8. The result of calculation is ().

A.B. C. D。

9. There are three identical right-angled trapezoids in the picture, and the area of the shaded part is ().

A.3 maximum and b.3 minimum.

C. The three sizes are different. Three are the same size.

10.6, the hour hand and the minute hand are in a straight line; 12, the hour hand and the minute hand are on a straight line, and the number of times a day and night is ().

A.24 B.48 C.46 D.44

Fourth, the calculation problem

1.

2.

3.

4.

5. Column calculation:

What is the product of (1)243 plus 72 times 2.5?

(2) As shown in the figure, ABCD is a parallelogram, ∠FBE=90? , take b as

Draw FE with the center of the circle and BF as the radius, and find the area of the shaded part in the figure (unit: cm, π is 3. 14, accurate to 1%).

Verb (abbreviation of verb) application problem

1. A batch of fruits accounts for 20% of the total canned amount. The rest is distributed to two fruit shops, A and B, at a ratio of 5: 3. Shop A is 400 kilograms more than shop B. How many kilograms are there in this batch of fruit?

2. Two athletes, A and B, are running on a circular track with a circumference of 800 meters. It is known that the average speed of B is160m per minute, the speed of A is twice that of B, and A is in front of B100m, both of which start at the same time. A will catch up with b in a few minutes.

3. Take out a barrel of oil for the first time, 3 kilograms more than the first time, and 27 kilograms twice. How many kilograms is this barrel of oil?