1.4/5 = () minutes 55cm = () mm.

2.16: () = ()/25-4/5 = 32 ÷ () = () times

3. 5/6 of a rope is 25m, and this rope is () meters long. It is divided into five sections on average, each section is () of the total length and each section is () meters long.

4. Profit 500 yuan +500 yuan, loss 300 yuan () yuan.

5. Knowing the () and () of the object can determine the position of the object.

6. In a pocket with/kloc-0 red balls, 2 white balls and 3 green balls, the possibility of finding a ball that is white is (), and the possibility of finding a ball that is not red is ().

7. A circle with a radius of 2 cm has a circumference of () and an area of (). If its diameter is doubled, its circumference is () and its area is ().

8. Find the pattern:1/20110 ()1/51/4 ().

Second, choose. (65438+ 0 point for each small question, ***5 points)

1. The side length of the square is1/4m, and the circumference is () m. ..

a . 1 b . 1/ 16 c . 1/8

2. Put 10g sugar into 1kg water, and the ratio of sugar to syrup is ().

a . 1: 100 b . 100: 10 1 c . 1: 10 1

3. To complete the same work, Party A can complete 1/4 and Party B can complete 1/6 every hour. Their time ratio is ().

B2:3 C.3:2

4. It is both a positive number and a fraction ()

1/2 c- 1/2

A rope is 3/4 meters long. Cut off the total length of 1/4 and ().

A.2/4m b.3/4m c.9/ 16m

Third, judge whether it is true or not. (65438+ 0 point for each small question, ***5 points)

1. Two numbers 1 are reciprocal. ()

2. The quotient of a fraction divided by an integer (except 0) must be greater than the dividend. ()

3. A circle has countless symmetry axes. ()

A circle with a radius of 2m has the same circumference and area. ()

Farmers use bamboo mats to form a cylinder, so as to accumulate more grains. ()

4. Write directly. (65438+ 0 point for each small question, ***8 points)

25×4/5= 4/9×3/8= 1/2- 1/3= 15÷5/3=

2/3+3/4= 1/6×6= 4× 1/2÷4= 3/8- 1/8=

I. Fill in "Seriously" carefully: (16)

1, 78% reading (); 7.5% writing ().

2、

3, in, 6.7% of these five figures, the biggest is (); The smallest is (); () and () are equal.

4. 75% of a number is 150, and 10% of this number is ().

5. The ratio of A number to B number is 3∶4, and A number is ()% of B number.

6.200 seeds were used for germination test. Results Four seeds did not germinate, and the germination rate was ().

7. A chemical plant completed 57% of the annual plan in the first half of the year; In the second half of the year, 64% of the annual plan was completed, and ()% of the annual plan was exceeded.

8. My mother's monthly salary last year was 1800. After RMB 65,438+0,654 38+0,000 is deducted according to regulations, individual income tax shall be paid at the rate of 20%. Last year, my mother paid () yuan of personal income tax.

Second, select "number search": (choose the serial number of the correct answer and fill it in brackets) (16 points)

1, the following figures can be rewritten as a percentage ().

① The rope is 0.75m long. ② Rice weighs 0.2 tons. Rice is flour.

Add "%"after 2.35, and the original number is ().

① Reduce 100 times ② Enlarge 100 times ③ Constant.

3. Dissolve 5g of salt in 35g of water, and the weight percentage of salt and brine is ().

① ② 12.5% ③ 1.25%

4. The interest rate is the ratio of ().

① Interest and time ② Principal and interest ③ Interest and principal.

5. The following statement is correct ().

① When the number of boys increases by 10% and equals the number of girls, the original number of girls is 10% of the number of boys.

② When the number of boys increases by 10% and equals the number of girls, the number of girls is less than that of boys 10%.

③ When the number of boys increases by 10% and equals the number of girls, the original number of girls is more than that of boys 10%.

6. This formula is ().

①50 is a few percent less than 80. (2) what percentage is 80 more than 50? ③50 is the percentage of 80.

7. The following incorrect statement is ().

(1) Of a batch of parts, 98 are qualified and 2 are unqualified, with a qualified rate of 98%.

(2) A book with 100 page, Xiaojun read 20% on the first day, and should start with 2 1 page the next day.

(3) a non-zero natural number divided by 25% is equivalent to reducing this number by 4 times.

8, Li Shifu processing a part of the time, from the original 5 minutes to 4 minutes, improve the work efficiency ().

①80% ②25% ③20%

Fill in the blanks. (**20 points, 2 points for each small question)

1._ _ _ _ _ _ is called proportion, and x = x can be written as proportion _ _ _ _ _.

2.5000000000 cm = _ _ _ _ km, 5 km = _ _ _ _ _ cm.

3. Because =, so _ _ _ _ _ _ _ = _ _ _ _ _ _ _ _ _.

4. The score is certain, and the score of _ _ _ _ _ _ is directly proportional to _ _ _ _ _.

5. It is certain that the base of _ _ _ _ _ _ _ _ _ _ parallelogram is directly proportional to its area.

6. If 6a = 5b, then A: B = _ _ _ _ _:, A: 5 = _ _ _ _ _ _.

7. The ratio of number A to number B is 2, and the ratio of number A to number B is _ _ _ _ _ _ _: _ _ _ _ _.

8.(9,8),(6, 12),(4, 18),(3,_ ),(_,36)。

9. Match 2, 5 and 8 with a number, which can be ().

10. The ratio of A number to B number is 4: 5, and B number is _ _ _ _ _ _% more than A number.

Second, choose. (5 points)

1. and: what can constitute the proportion is ().

a:B:5c、5:6 D、6:5

2. If x = y, then y: x = ().

a、 1: B、 1:C、3:4 D、4:3

3. The radius and perimeter of the circle ().

A, proportional b, proportional c, disproportionate d, it doesn't matter.

4. Make four numbers 4.5, 7.5, 0 and 0 proportional, and the product of its internal terms is ().

a、 1.35 B、3.75 C、33.75 D、2.25

5. Xiao Ming's time and speed from home to school ().

A, proportional to B, inversely proportional to C, out of proportion

Third, the judge. (5 points)

1, the flour yield of wheat is certain, and the total weight of wheat is directly proportional to the weight of flour. ( )

2. The diameter of the wheel is fixed, and the number of revolutions of the wheel is directly proportional to the distance traveled. ( )

3. If a×3=b×5, then a:b=5:3. ( )

4.y=8x, which means that x and y are in direct proportion. ( )

5. The length and width of a rectangle are inversely proportional. (

Fill in the blanks. (1 minute per grid, ***20 points)

(1) In general, a () is developed on the cylinder side and a () is developed on the cone side. When the cylinder is unfolded, its side is square, which means that its () and () are equal. The surface area of a cylinder is equal to () plus (). The volume of the cone V= ().

② The circumference of the cone bottom is 18.56 cm, and the height is 8 cm. Cut it into two equal halves along the height from the vertex, and the surface area will increase by () square centimeters.

(3) The volume of a cylinder is 18.84 cubic centimeters, so the volume of a cone with equal bottom and equal height is () cubic centimeters.

(4) The volume of a cone is 18 cubic decimeter, so the volume of a cylinder with equal bottom and equal height is () cubic meters more than it.

⑤ The volume of a cone is 6.28 cubic centimeters smaller than that of a cylinder with equal bottom and equal height, so the volume of this cone is () cubic centimeters; The volume of a cylinder is () cubic centimeters.

⑥ Fill in the form

High transverse area surface area volume of the nominal bottom strip

The radius of the cylinder is 3 cm and 20 cm.

Circumference 25. 12 decimeter 12 decimeter

Cone diameter 10cm 15cm

The area is 50.24 square centimeters and 9 centimeters.

Second, judge. (5 points)

1, the volume of a cylinder is three times that of a cone. ( )

2. A cuboid with equal base and equal height has the same volume as a cone. ( )

3. The surface areas of two cylinders are equal, and their volumes must be equal. ( )

When a cylindrical glass contains 1dm3 of water, we can say that its volume is1l. ( )

5. When the radius of the bottom of the cone is enlarged by 3 times, its volume is enlarged by 9 times. ( )

Third, choose. (5 points)

1, the calculation method of cylindrical lateral area is indicated by the letter ().

a、πrh B、πdh C、πr2h

2. The diameter of the bottom surface of the cylinder is 8㎝, the height is 8㎝, and its side development diagram is ().

A, circle b, rectangle c, square

3. A log is sawed into three sections, one with a round face. ( )

a、3 B、4 C、2

4.( 1) How much iron sheet does it take to make a cylindrical ventilation pipe? It is a ventilation pipe ();

(2) How many milliliters of water can a cylindrical bucket hold is the requirement of the bucket ().

A, volume b, surface area c, volume d, side area