Fourth, the final volume of mathematics in Beijing Normal University.

First, I can directly write the number of the following questions.

40×3= 30×50= 50×20= 40×(250-200)=

23×4= 18×5= 600×20= (400+200)÷3=

64÷4= 50÷2= 84÷7= 70×(360÷6)=

34÷2= 250÷50= 140÷7= 2 10÷30+30=

Second, let me fill it out carefully.

1. A number consists of five tens, six tens, four thousand dollars and eight tens. This number is (), and the number rewritten as "10,000" is (). After rounding the mantissa behind the billion digits, it is ().

2. By the end of 2004, the population of China reached1299.88 million.

3. When reading eight digits, read the number of () level first, and then read the number of () level.

4. The largest eight digits is less than the smallest nine digits ().

5. In the same plane, if two straight lines are not parallel, it must be ().

6. Draw a point on a straight line, which can be regarded as () ray.

7. It is known that ∠2 = 60O∠ 1 = ().

∠3=( ),∠4=( )。

8. Fill in > □ 556073 6.72 million 436890 > () million > 849256000 > () billion.

I will choose the letter of the correct answer and fill in the brackets.

1. In 56÷7=8, to make the quotient 80, then ().

A, dividend reduction 10 times b, dividend expansion 10 times.

C, dividend and divisor expansion 10 times.

D, the dividend with constant divisor is enlarged 10 times or reduced 10 times.

2. Compare the approximate figure of 650,000 with the exact figure of 650,000.

A, the approximate number is big B, and the exact number is big C, which is equal to D, which is uncertain.

3. The formula of product less than 8000 is ().

a、404×2 1 B、 190×39 C、 140×500 D、34×300

4. The formula with three zeros at the end is ().

a、25×60 B、30×70 C、800×40 D、57×60

5. A square has () groups of vertical lines.

a、 1 B、2 C、3 D、4

I'll calculate the following questions vertically.

528×45= 670×320= 750÷25=

5. The following questions are simple.

425÷( 155― 130) (765―230)×45 109+ 127+73

608― 154― 146 165―97 258+98

Six, I'll do it.

1. Measure the degrees of the following angles.

Measure () Measure () Measure ()

2. Draw a rectangle with the following two lines as two sides of the rectangle, and then measure it.

(1) Preliminary estimation shows that the rectangular area is about () cm2.

(2) After measurement, the length, width, perimeter and area of the rectangle are () cm, () cm and () cm2 respectively.

(3) The sum of the degrees of the four corners of a rectangle is equal to () a straight angle and () a rounded corner.

Seven, solve the problem.

1. Dio's father's monthly salary is 3,000 yuan, and he needs to pay personal income tax in 2005 155 yuan. According to the revised tax law, he only needs to pay 1 15 yuan in 2006. How much personal income tax did Ou Di's father pay less than before in 2006?

2. Please choose an appropriate calculation method to solve the following problems.

Provinces, cities, Beijing, Hebei, Heilongjiang, Shaanxi and Guizhou

Afforestation area (km2) 31777 356071205658 436572 240692

(1) What is the afforestation area in Beijing and Hebei Province?

(2) What is the average afforestation area of these five provinces and cities?

3. A pedestrian street uses 860 pieces of 60 cm×60 cm granite floor tiles, each with 25 yuan. The cost of labor and other materials for laying floor tiles needs 2300 yuan. How much does it cost to pave this pedestrian street?

4. The prices of commercial housing in some cities in 2004 are as follows.

(1) Buy a set of160m2 in Chongqing.

How much is the commercial house?

(2) What other math questions can you ask?

Please bring it up and solve it.

5. People's Primary School held a skipping contest. This is the report card of five students.

Name: Li Lin Zhang Min

Grade (below)11812094130103

(1) Fill in the following statistics table according to the information in the statistics table.

Statistical table of skipping competition results

(2) The 1 is (), the second is (), and the third is ().

(3) Estimate that the average skipping performance of the five of them is ().