1. A number is 5 in the hundredth place, 4 in the hundredth place, and the rest are 0. This number is written as _ _ _ _ _, and one digit after the decimal point is _ _ _ _.

2.6, 10, 18, 5 1 Of these four numbers, _ _ _ _ _ _ _ is both a composite number and an odd number. _ _ _ _ _ and coprime.

3. Choose three numbers from 0, 4, 5, 8 and 9 to form a number divisible by 3. The largest of these figures is _ _ _ _ _, and the smallest is _ _ _ _ _.

4. The quotient of A divided by B is 10, the sum of A and B is 77, A is _ _ _ _ _, and B is _ _ _ _ _.

5 The distance that a bicycle wheel rolls forward for two weeks is one meter, and the circumference of the wheel is _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

6. Of the 50 people infected with atypical pneumonia in a certain area, 12 were medical personnel, accounting for%. The ratio of infected medical staff to other infected people is _ _ _ _.

7. Li Ming bought a 4000 yuan Treasury bill with a fixed term of three years and an annual interest rate of 2.89%. After the expiration, he donated the interest to Project Hope to help poor children. Li Xiang donated RMB _ _ _ _ _

8. The scale of a map of China is1:4,500,000, and it is rewritten as line segment scale. On this map, the distance from Nanjing to Beijing is measured as 20.4 cm, while the actual distance from Nanjing to Beijing is _ _ _ _ _ _ kilometers.

9. The side length of a cubic object is 2 decimeters. To wrap four such items with paper, at least _ _ _ square centimeters of paper should be used. (Overlap ignored)

10. Put seven red pencils and three blue pencils in a bag, and you can touch 1 at one time, so you can touch 10000 times, accounting for about% of the total times. Touching a red pencil will probably have _ _ _ _.

Second, the choice: (7 points)

1. In the following fractions, it cannot be converted into a finite decimal ().

① 7/28 ② 13/40 ③ 9/25 ④ 8/ 15

2. There are more boys than girls, and the ratio of boys to girls is ()

① 1:4 ②5: 1 ③5:4 ④4:5

3. In the following questions, two related quantities are directly proportional ().

① The perimeter of an equilateral triangle and the length of any side ② The volume of the cone remains unchanged, the bottom and height ③ The side length of the cube remains unchanged, and the volume and bottom area ④ Interest and interest rate.

4. When estimating 7. 18×5.89, the smaller error is ().

①8×6 ②7×6 ③7×5 ④8×5

5. The ratio of expanding the sides of a cylinder into an equal quadrilateral to a rectangle. ( )

① Smaller area and longer weeks ② Equal area and longer weeks.

③ Equal area and smaller circumference ④ Equal area and longer circumference.

6. When using peracetic acid for disinfection, the disinfection water should be prepared according to 1: 200. Now he puts 0.3 kg of peracetic acid solution into 50 kg of water. In order to make the disinfection water meet the requirements, it should be ()

① Add 0.2kg of liquid medicine ② Pour out 5kg of liquid medicine.

③ Add10kg of water ④ Add 20kg of water.

7. Draw the largest semicircle in a rectangle 5 cm long and 3 cm wide. The circumference of this semicircle is () cm.

①9.42 ② 18.84 ③ 14.42 ④ 12.85

Third, judge whether the following statement is correct. (6 points)

1. Add "0" or remove "0" after the decimal point, and the size of the decimal point remains unchanged.

Xiao Ming said, "My cousin was born on February 29th, 1998."

3. The natural number including divisor 2 must be even.

4. There are line segments on both sides of the corner.

The product of any two numbers is greater than their quotient.

6. The quantity of A is 25% less than that of B, and the ratio of A to B is 3∶4.

Fourth, calculation.

1, write directly. (5 points)

15×3/20= 2/3÷0.5÷2= 1 3/4+0.25= 0. 1÷ 1%= 2.5÷5=

2/5÷ 1/ 10= 2/3- 1/4= 4. 1- 1.3= 2.8-4/7+ 1.2= 3.5×9+3.5=

2. Find the unknown X.(6 points)

3/5: 12 = 1/2:X X-0. 15X = 8.5 3.6:X = 2/3

3. How to simply calculate the following questions? (12)

(+×)÷ ÷[×(+)]

(+)×8+ 4.5-(+ 1.5)-

Verb (abbreviation of verb) application questions (1-9 4 points for each question, 10 9 points for each question)

1. Look at the chart and calculate:

2. A piece of "84" disinfectant packaging paper states: When cleaning the bathtub, the stock solution and clean water should be prepared according to 1:300. Li Nainai poured out10g of this disinfectant. How many kilograms of water does it take to clean the bathtub? (Use proportional solution)

3. It takes 12 hours for Party A to complete a manuscript alone, and 15 hours for Party B to complete it alone. B typed for five hours first, and A typed the rest of the manuscript. How many hours will it take to finish typing?

4. Aunt Wang's cabinet air conditioner is 0.4m long, 0.2m wide and 1.7m high. In order to prevent dust, Aunt Wang is going to cover this air conditioner with a rectangular cover made of cloth. Please help her figure out how many square meters of cloth is needed to make this cover. (Seam * * needs 0.2 m2 of cloth).

5. For the sake of students' health and safety, the school provides each student with a water cup, with a 10% discount for each water cup in 3 yuan and Ocean Mall, and "buy eight and get one free" in Baihui Commercial Building. The school wants to buy 180 cups. Please be a "staff officer" and find out: which is more cost-effective? Please write down your reasons. (5%)

6. Both Party A and Party B walk in the same direction at the same time. Party A walks 100 meters per minute, and Party B walks 120 meters per minute. 12.5 minutes later, the distance between them is150m. How many meters is there between A and B?

7. A rectangular reed mat with a length of12.56m and a width of 3m is enclosed in a cylindrical grain depot with the length as the bottom (not counting the combined consumption). What is the volume of this closed grain depot?

8. A township built a canal. 50% of the total length of the first phase and 35% of the total length of the second phase, leaving 80 meters. How long is this canal around the mountain?

9. Zhangzhuang originally planned afforestation last year 128 hectares, but actually completed the planned afforestation 125%. How many hectares has it actually planted more than planned?

10. Taxi charging standards in a city are as follows: (9)

Mileage cost

3 km and below 8.00 yuan

More than 3 kilometers, one way, each additional 1 km 1.60 yuan.

More than 3 kilometers, round trip, each additional 1 km 1.20 yuan.

(1) Lily takes a taxi from home to grandma's house, paying 17.6 yuan. How many kilometers is it from Lily's house to Grandma's house? (3)

(2) Teacher Wang took a document from the Personnel Bureau 6 kilometers away from the school and went back to school immediately. How can he get a better ride experience? How much do I have to pay for taking a taxi? (6