First, think carefully and sit in the right position: (2 1 minute)

1, consisting of 500 million, 8 million, 6 million and 3500 (), rounded to 1 100 million is about ().

2. There are girls A in one class, 2 less than boys, and there are boys () in this class. If a=35, there are () people in this class.

3. 25% of a number is ().

4. Make a rectangular frame with a length of 1 decimeter, a width of 6 cm and a height of 2 cm, at least () cm, and stick a layer of paper outside the rectangular frame, at least () cm square.

5. Master and apprentice produce a batch of parts, and the ratio of master and apprentice is 6: 5. Apprentice production 120, master production (). There are () parts in this batch.

6, 1 hour 25 minutes = () hours; 490,600 square meters = () hectares.

7、 3:( )= =3÷( )=( )%=0.375

8, in the score, when x= (), this number is the smallest false score; When x= (), this score is the maximum true score.

9. Put 36 kilograms of candy into 7 bags on average, and each bag can hold () kilograms. According to this calculation, 35 bags can hold () kilograms of candy.

10, the sum of the volumes of cylinders and cones with equal bottoms and equal heights is 36 cubic decimeters, and the volume of cylinders is () cubic decimeters.

Second, carefully scrutinize and distinguish between right and wrong. (6 points)

1. Move the decimal point of a number two places to the left and three places to the right, and the result is 10 times of the original number. ( )

2. Two prime numbers have no common factor. ( )

3. If the lateral spread of a cylinder is square, the ratio of its bottom circumference to its height is 1: 1. ( )

4. 102 seed germination, 100 seed germination, germination rate 100%. ( )

The diameter of the wheel is fixed, and the driving distance is equal to the circumference of the bottom of the wheel, so the height must be equal. ( )

6, a book, has read 75%, and then read, it should start from 46 pages. ( )

Third, after repeated comparison, the best admission: (10)

1, with the four numbers of 2, 0, 8 and 6, you can form () three numbers without duplicate numbers.

①24 ②8 ③ 18 ④ 12

2.A and B are two natural numbers that are not 0, a÷b=6, and the least common multiple of A and B is ().

① a ② b ③6 ④ab

3. A part drawn on the drawing is 5mm long and 20cm long. The scale of this picture is ().

① 1:4 ②4: 1 ③40: 1 ④ 1:40。

4. The average height of Xiao Ming's class is 1.4m, and that of Xiao Qiang's class is1.5m. Xiao Ming is taller than Xiao Qiang ().

① Height ② Short ③ Same height ④ Uncertain.

5. Smile and play a touch game. * * * Touched the ball 30 times, and as a result, it touched the red ball 20 times, the white ball 5 times and the yellow ball 5 times. The most likely installation method is (). (It is known that there are 6 balls in the bag)

① 3 red balls, 2 white balls and yellow balls 1 ball; ② Four red balls, white balls 1 and yellow balls 1.

③ 2 red balls, 2 white balls and 2 yellow balls; ④ Three red balls, three white balls 1 and two yellow balls.

Fourth, see the topic clearly and think skillfully: (19 points)

1, write numbers directly! (3 points)

10÷ 190× = 0.25× 1.38×4=

12.75-(3.75+3.8)= 6.9÷(2. 1÷7)=

(4+320 )× 10= 1÷23 ×32 =

2, ask the unknown, I have no problem! (4 points)

( 1)X-X =(2)25(X-)= 25%

3, clever calculation is fine and clever! (Write a simple calculation process if you can do it simply) (12 points)

0.63× +0.37×25% × 19+

9÷ [ 1- + ] (4-3.5× )÷

5. I can do table calculation: (8 points)

What is the quotient of (1) minus the product and then divided by it?

The number less than 32 is 28. Find this number.

Six, hands-on, exploration and innovation (10)

1, given the light BM, accurately draw the figure step by step with a protractor and a triangle according to the following requirements. (6 points)

(1) Make a 60-degree < ABN with B as the vertex to make BA = 2cm；;

(2) Make a line segment AD from point A so that AD‖BM, AD = 3 3 cm;

(3) If the vertical DC of ray BM is taken from point D and the vertical foot is C, then the quadrilateral ABCD is () shaped.

2. Wang Fei borrowed books from the library 5 kilometers away from home by bike. He went there at 7.5 kilometers per hour and came back at 5 kilometers per hour. He spent several hours borrowing books from the library. Please complete the following broken line statistical chart according to the above information. (4 points)

Seven, into life, solve problems: (26 points)

1, the following questions are only calculated (or equations), not calculated. (9 points)

(1) Last year, steel mills produced 2.4 million tons of steel, 600,000 tons more than planned. What is the percentage of actual output exceeding the plan?

(2) The store shipped 300 kilograms of apples and 6 kilograms of pears less than five times. How many kilograms of pears did this shop ship?

(3) I bought some rice in the canteen and ate it for four days, leaving 120kg. How many kilograms of rice are there?

2. A conical wheat pile, with a height of 1.2m and a bottom circumference of12.56m. If the wheat weighs 750kg per cubic meter, how many kilograms does this pile of wheat weigh?

3. Build a canal. The first week is the whole journey, and the second week is 60 kilometers more than the first week. At this point, the ratio of the repaired kilometers to the unrepaired kilometers is 7: 3. How long is this canal?

There is a parallelogram parking lot on the map, with a scale of 6 cm and a height of 5 cm. What is the actual area of this parking lot?