1. 12 tons = 800 kg () tons.

3.85 cubic meters = () cubic decimeter; 4 liters 40 ml = () liters

2. The largest three-digit number that can be divisible by 2 and 3 at the same time is ().

3. When X= (), the values of 4x-8 and 5x- 12 are equal.

The sum of the sides of the cube is 48 decimeters. The surface area of this cube is () square decimeter and the volume is () cubic decimeter.

The sum of numbers a and b is 8.5. If the decimal point of the number A moves one place to the right, it is exactly seven times that of the number B. The number B is ().

6. Fill in the appropriate unit name in brackets:

The volume of an eraser is about 8 (); One classroom accounts for about 48 ().

The volume of the car fuel tank is 30 ();

The length of each step of Xiao Ming is about 60 ().

Among natural numbers within 7.20 (including 20), there are () odd numbers and () even numbers.

8. () is divisible by () in14,6,15,24, and () and () are prime numbers.

9. The largest two-digit number that can be divisible by 2, 3 and 5 at the same time is (), and the prime factor to decompose it is ().

10.5 □ When () is filled to the maximum, this number can be divisible by 3, and the divisor of this number is ().

1 1. If A is divisible by B, the greatest common divisor of A and B is (), and the least common multiple of A and B is ().

12. It is known that a = 2×2×3×5, B = 2× 5× 7, the common prime factor of A and B is (), and their greatest common divisor is ().

13. Cut a 2-meter-long rectangular steel into two sections along the cross section, and increase the surface area by 0.6 square decimeter. The volume of this rectangular steel is () cubic decimeter.

14.2.05m2 = () square decimeter

850ml = () L (fill in score)

15. The side length of the cube is 0.6 decimeter, and the surface area is () square decimeter.

16.□2□ is a three-digit number, which can be divisible by 2, 3 and 5. The smallest digit of this three-digit number is (). 17. A cube with a side length of 6 cm can be cut into () cubes with a side length of 2 cm.

Second, judge.

1, nonzero natural numbers are either prime numbers or composite numbers. ( )

2. The multiple of a number must be greater than its divisor. ( )

3. The product of two prime numbers must be a composite number. ( )

4. A cuboid (excluding cubes) has at most 8 equilateral sides. ( )

5. Even numbers greater than 2 are composite numbers. ( )

6. The numerator of a false score must be greater than its denominator. ( )

Third, choose.

1. If a = 5b, the least common multiple of a and b is (). (A and B are both natural numbers)

a、a B、b C、ab D、5

2. The circumference of an isosceles triangle is 50 cm, the base length is 14 cm, and one waist is () meters.

a、36 B、22 C、 18 D、 1 1

3. The quotient of two numbers is 1.5, the dividend is reduced by 10 times, the divisor is expanded by 100 times, and the quotient is ().

a、 1500 B、0.00 15 C、 15 D、0.0 15

4. When the natural number A is divided by the natural number B, the quotient is 5, and the least common multiple of these two natural numbers is ().

A, B, B, C, V

5. The greatest common divisor of 5.a = 2× 2× 3 and b = 2× 3× 5ab is ().

a、6 B、3 C、2

6. The side length of the cube is enlarged by 3 times, and the volume is enlarged ().

A, 3 times b, 9 times c, 27 times

7. There are () two numbers greater than 0. 1 less than 0.2.

A, 9 B, 0 C, countless d, 99

8. Two decimal places are accurate to 5.0, and the minimum number of digits is ().

a、4.99 B、5. 1 C、4.94 D、4.95

9. Epiphyllum can last at least 4 hours, and the flowering time of wheat is 0.02 times that of Epiphyllum, which is about ().

A, 0.8 minutes b, 5 minutes c, 0.08 minutes d, 4 minutes.

10.4 is 20 ()

A. prime factor of multiple divisor

Third, solve the problem.

1. An iron oil tank with a rectangular cover, 3 cm long, 3 cm wide and 8 cm high. How much iron does it take to make such a fuel tank? The fuel tank contains 0.85 kg of fuel per cubic meter. What is the maximum fuel quantity?

2. A cuboid glass cylinder, measured from the inside, is 40 cm long and 25 cm wide, and the water depth in the cylinder is 12 cm. After a stone is immersed in water, the water surface rises to 16 cm, and the volume of the stone is found.

3. The distance between A and B is 120km. It took someone five hours to get from A to B by bike, and it took four hours to accelerate when he came back. How many kilometers does he drive per hour on average?

4. Make 12 rectangular iron chimney, each with a length of 2m, a width of 4m and a height of 3m. How many square meters of iron do you need at least?

2. Fill in "Be careful". 20 points (2 points for each small question)

1 decimal unit. Is (), plus () this unit is the smallest prime number.

2. () ÷16 = = () (decimal)

3. The greatest common factor of12 and 18 is (), and the smallest common multiple is ().

4. Divide the 5m-long rope into 9 segments on average, each segment accounts for () of this rope, and each segment is () meters long.

5. A two-digit number is not only a multiple of 5, but also a multiple of 3, and it is even. The minimum quantity is () and the maximum quantity is.

Yes ().

6. The sum of the sides of a cube is 24 decimeters, its surface area is () and its volume is ().

7. In a shooting training, the shooting times of eight students are as follows:

4, 5, 4, 6, 10, 9, 8, 10.

The average value of this set of data is (), the mode is (), and the median is ().

Xiao Ming, Xiao Li and Xiao Kai read the same article. Xiao Ming spent several hours, Xiao Li spent several hours and Xiao Kai spent several hours.

0.2 hours, () is the fastest.

9. There are 12 apples, of which 1 1 is as heavy, and the other one is lighter, which can be weighed at least () times with a balance.

Be sure to find this apple.

10. A cuboid with length, width and height of 8cm, 5cm and 4cm respectively. After cutting off the largest cube,

The remaining volume is ().

3. Choose a "corresponding seat". (Choose the number of the correct answer and fill in the brackets) 10.

1. A pool can store 430 m3 of water, so we say that () of this pool is 430 m3.

A. surface area b weight c volume d volume

2. The left picture is obtained by () transformation.

A. translation B. rotation C. symmetry D. folding

3. The following statement is true ().

A. unit of volume is greater than the area unit. B. if it is a false score, then a must be greater than 5.

C. a natural number with only two factors must be a prime number. A triangle is a symmetrical figure.

4. There are () odd numbers and composite numbers within10.

A.0 B. 1 C.2 D.3

Add 8 to the molecule of 5. If you want to keep the size of this score unchanged, the denominator should be ()

A. add 30 b. add 8 c. zoom in twice. D. increase by three times.

2. The road team built a road, with kilometers in the first week, kilometers in the second week, and more in the third week than in the previous two weeks.

Less kilometers, how many kilometers were built in the third week?

3. A rectangular fish pond 8 meters long, 5 meters wide and 2 meters deep should be built in the park.

Cement, 0.8 m2 can be wiped per kilogram of cement. How many kilograms of cement does a * * * need?

4. A story book *** 100 page, Xiaohong read the whole book on the first day, and 20 pages on the second day for two days.

What score?

5. Rectangular water tank, length 10 dm, width 8 dm and water depth 4.5dm.. When a stone is put into the water tank, the water level will rise.

Up to 6 dm. What is the volume of this stone?