1. The total retail sales of social consumer goods in a city in 20 10 was 3,568,888 yuan. This number is written as (), and the mantissa after omitting one hundred million digits is about () one hundred million yuan.

2.80705000 is pronounced as (), and 7 is in the position of (), indicating ().

3. 2039 □ 568 ≈ 20.39 million, □ can be filled in () and ().

The order of 4.505050, 550050, 500500 and 5005500 from small to large is ().

5. Among the four angles formed by the intersection of two straight lines, one is a right angle and the other three are ().

6. When calculating 370÷42, consider the divisor as () trial quotient and trial quotient ().

7. The quotient of □ 46 ÷ 59 is two digits, □ can be filled with (), and the minimum value is ().

8. Write the following results directly.

16×38=448

160×38=( )

160×380=( )

9、 1= 1/2, 2=(), 3=( )

10, Xiao Ming bought five pens with 20 yuan money. How much is the average pen? The quantitative relationship to solve this problem is ().

Second, carefully scrutinize and distinguish between right and wrong. Mark "√" for the right and "×" for the wrong.

1. Two straight lines can intersect or be parallel on the same plane. ()

2. 1 Numbers above six digits are seven digits. ()

3. The isosceles trapezoid is an axisymmetric figure. ()

If three digits are divided by two digits, the quotient must be two digits. ()

5. The quotient of dividing two numbers is 100, and the quotient of dividend and divisor divided by 10 is 1. ()

Third, compare repeatedly and choose carefully.

1. After Tu Tu came home from school, his mother said, "I'll cook your favorite braised fish for dinner. But you should help your mother design how to arrange the meal time as soon as possible. " (Kill and wash fish for 8 minutes, cook fish 10 minutes, wash rice for 2 minutes, and cook rice 15 minutes. It will take at least () minutes to start dinner as soon as possible.

A: 20

b、 18

c、 17

2. Divide two numbers. If the dividend is multiplied by 3, the divisor should be () to keep the quotient unchanged.

A, multiplied by 3

B, divided by 3

C, unchanged

3. A set of quadrilaterals with parallel opposite sides and equal other two sides must be ().

First, isosceles trapezoid

B, trapezoid

C, square

Fourth, careful calculation and careful investigation.

1, a number written directly.

4800÷80=

4200÷600=

75÷ 15=

160×50=

60×70=

480÷20=

539 1÷9≈

78× 10 1≈

892×6≈

2. Column vertical calculation.

16×253

3 15÷20

3276÷84

420×60

3. Column calculation.

What is the 12 times of (1)206?

(2) How many 18 are there in 738?

Fifth, apply knowledge to solve problems.

1, a bus travels 204 kilometers in 3 hours. At this speed, how many kilometers can 12 hour travel?

2. I hope the teachers and students of grade four in primary school will go to the park, and the ticket price is 5 yuan per person. There are 238 students and 6 teachers/kloc-0. How much does it cost them to buy a ticket?

3. The school bought six boxes of ink, each containing 12 bottles, and it cost 576 yuan for one box. How much is a bottle of ink?

4. There are 720 shuttlecocks, one drum for each 12 shuttlecock. How many drums were packed, and then there were 36 badminton left?