2.4÷0.04= 125×32= 0.25×0.4=

1.29-0. 18= 13-7.2-2.8= 0.88+0. 12= 0.42=

( ): =

Fill in the blanks (2 points for each small question, * * * 36 points)

1: The distance from Venus to the sun is 1082 1 10,000 kilometers. Write () kilometers, and rewrite this number as "1 100 million", which means () 10,000 kilometers.

2. The average of A and B is 105, the ratio of A and B is 4: 17, A is () and B is ().

3. If 5A=3B, then a: b = ().

After 4: 150 is reduced, kg is reduced, and the result is () kg.

5: Cone and cylinder have the same bottom area and volume respectively. If the height of the cylinder is 6 cm, then the height of the cone is () cm.

6. The sixth-grade students participated in tree planting activities, 90 trees survived, 10 trees did not survive, and the survival rate was ().

7. On the map, there is a line segment with the scale of 0 30 60 90km. Write it as a numerical scale in the form of (). On this map, it is measured that the distance from Ningbo to Shanghai is 65 438+02 cm, and the actual distance from Ningbo to Shanghai is () km.

8: The maximum true score of a fractional unit is (). Adding () to it makes the fractional unit equal to the minimum prime number.

9:( )÷8= =0.25=( )%=( ): 16

10: a five-digit 8□35△. If this number can be divisible by 2, 3 and 5 at the same time, then the number represented by □ is () and the number represented by △ is ().

1 1: Uncle Zhang bought a two-year national debt of 2,000 yuan, with an annual interest rate of 4. 1%. After two years, he can get the principal and interest of * * * () yuan.

12: a car carrying goods from the factory to the dock, the speed is 40 kilometers per hour when going, it takes 3 hours to arrive, and the speed is 60 kilometers per hour when coming back. The average speed of the round trip is () kilometers per hour.

13: Divide a cone into two parts with the same volume and shape along the bottom diameter, with an increase of 96 square centimeters in surface area, 6 centimeters in cone height and () cubic centimeters in cone volume.

14: The length of a precision part is 4 mm and the length drawn on the drawing is 4 cm. The scale of this picture is ().

15: Change 2.4: into the simplest ratio () and the ratio is ().

16: When Xiao Mahu added a decimal place to 2.53, he got 4. 18 because he aligned the mantissas wrong. The correct number should be ().

17: it will be converted to decimal, and the100th place after the decimal point is ().

18: The sum of a number and its own addition, subtraction, division, sum, difference and quotient is 8.6, so this number is ().

Three: multiple-choice questions (2 points for each small question, *** 10)

1: A number is 25% more than B number, and B number is less than A number ().

A: 20% B: 25% C: 75%

2. Dissolve 5g of salt in 45g of water, and the ratio of salt to brine is ().

A: 1:8 b: 1:9 c: 1: 10

The price of a commodity rises by 20% first, and then falls by 20%. The result of comparing the current price with the original price is ().

A: The current price is equal to the original price. B: The current price is higher than the original price. C: The current price is lower than the original price.

4. In order to reflect the changing trend of temperature in a certain place, meteorological observation stations generally choose () statistical chart.

A: horizontal bar b: broken line c: fan-shaped

5: The ball has three colors: red, yellow and blue. If you want to make sure you find two balls of the same color, you must find at least () balls.

A: 2 B: 3 C: 4 D: 5

Four: Calculation problem (***32 points).

1: Find the unknown x (3 points for each small question, 9 points for * * *).

X-= 1.75 20% X- 1.8×4 = 0.8 1 14:X = 0.4:8

2. Off-model calculation (simplify what can be simplified; 3 points for each small question, ***9 points).

12 ÷ 25 - 23 ×7 10 85×25+85×85- 10×85 13.8― 79 + 6.2 ― 1 19

3. Text questions (3 points for each small question, ***6 points).

(1)4.6 minus the difference of 1.4, (2) a number is less than 4 times of 30,

What was the result? What's this number? (Equation solving)

4: Find the surface area of the cuboid below. (Unit: cm) (4 points)

10

20

5: Calculate the area of the shaded part below. (Unit: cm) (4 points)

Four: application questions (6 points for each small question, 36 points for * * *).

1: A house needs 96 square bricks with a side length of 3 meters. How many bricks do you need if you replace it with a square brick with a side length of 4 cents? (Use proportional solution)

There is a batch of fruit in the shop, and the ratio of the number of baskets sold to the number of unsold baskets is 3: 5. If you sell 44 baskets, how many baskets of fruit will you sell?

3. Yongxin Farm Tools Factory produced a batch of farm tools, which was originally planned to be completed in 15 days, but actually produced 280 pieces per day, which not only completed the task in 12 days, but also overfulfilled 360 pieces. How many pieces were originally planned to be produced every day?

4. There are 36 boys and girls in the school mathematics interest group, of which 5/9 are boys. Later, boys also participated. Now the ratio of boys to girls is 2: 1. How many people are there in the math interest group now?

There are 26 sets of chess and checkers in the school, just enough for students to carry out activities at the same time. Two people play chess and six people checkers. How many sets of chess and checkers are there?

6: A car goes from A to B ... If the speed is increased by 25%, it can arrive 24 minutes earlier than the original time; If you drive 80 kilometers at the original speed and then speed up 1/3, you can reach the second place 10 minutes in advance. How many kilometers is it between A and B?