1.101 million is (), and there are () million out of 100 million. Like this, the forward speed between every two adjacent counting units is ().

2. The largest seven-digit number is () and the smallest eight-digit number is (). The difference between them is ().

3. A number with tens of millions and tens of thousands of digits is 5, the tenth digit is 8, and the rest digits are 0. This number is written as () and pronounced as ().

The number consisting of 460 million, 7 million, 3 thousand and two is (), which can also be regarded as () 10 billion, () 1 0 million and ()10.

5. The product of three digits multiplied by two digits may be () digits or () digits.

6. When estimating 506×68, 506 can be regarded as (), 68 as (), and the estimated result is about (), which is different from the actual result ().

7. Rounding 7 □ 7890000 ≈ 800 million, □ can be filled in ().

8. The plane flies 960 kilometers per hour, 960 kilometers per hour can be written as ().

9. The product of two numbers is 450, one multiplier is enlarged by 100 times, and the other multiplier remains unchanged. Now the product is ().

The product of 10.850×25 is () digits. There are () zeros at the end of the 25×400 product.

1 1. 10 The stacking height of nickels is about 1 cm. In this way, the stacking height of 1000 nickels is about () meters, and the stacking height of 1 10,000 nickels is about () meters.

It is about () meters, and the height of 1 100 million pieces stacked together is about () kilometers.

Second, choose one. (7 points)

1.7 to 7: 30, the minute hand turns ().

a、30 B、90 C、 180 D、60

2. Among the following formulas, the formula that is different from the calculation result of 15× 160 is ().

a、 150× 16B、30×80C、30×320D、60×40

3. The largest number of symmetry axes in the figure below is ().

A, square b, equilateral triangle c, rectangle d, circle

4. The number closest to 300,000 is ().

A292000B302000C300200

In 5.500050005000, from the left, the second "5" means ().

1500 million 500,000 500,000

6. As shown in the figure on the right, you can get triangle B by bypassing point O ().

A. rotate 90 B counterclockwise. Turn 60°C clockwise. Rotate 90 degrees clockwise.

7. The speed of the car is 35 kilometers per hour. How many kilometers does it travel in five hours? The formula used is ().

A. distance/time = speed B. speed× time = distance C. distance/speed = time

Third, the calculation problem. (24 points)

1. Write the number directly. (8 points)

23×300=320×4=8×6+7=2700000= () ten thousand.

220× 40 = 42× 200 = 9× 7+8 = 37000000000 = () billion.

2. Use vertical calculation. (8 points)

305× 16=35×6 18=230×63=850×20=

3. Make the calculation as simple as possible: (8 points)

129+46+54 189-82- 1883×25×4 196-(32+96)

Fourth, complete the following questions as required. (19)

1. Omit the mantissa after "ten thousand" and write the approximate number. (3 points)

345360000≈94999≈7684930≈

2. Omit the mantissa after "100 million" and write a rough figure. (3 points)

3990000000≈7684930000≈53097000000≈

3. Write the product of the following two questions directly according to the product of each group of 1 questions. (6 points)

25×3=758× 16= 12824×5= 120

25×30=8× 160=24× 15=

25×300=8× 1600=48×5=

4. Draw the following figures as needed. (4 points)

Rotate the quadrilateral 90 degrees clockwise around point a.

Complete the rightmost graph to make it axisymmetric.

5. Look at the diagram. (3 points) How many science books and story books do you want?

technology tree

storybook

Fifth, solve practical problems. (22 points)

1. A car travels from place A to place B at a speed of 95 km/h and arrives in 8 hours. It took 10 hours to return from B to A. What was the average speed of this car when it returned? (4 points)

An elephant in the park eats 240 kilograms of food a day. The breeder has prepared 5 tons of food, enough for the elephant to eat for 20 days? (4 points)

3. Master Zhang has to finish the processing task of 850 parts, which has been processed for 5 days, and the rest are 50 less than those already processed. How many parts does Master Zhang process on average every day? (Draw first, then answer) (4 points)

Xiaoming and Xiaohong have 90 stamps. If Xiaoming gives Xiaohong five stamps, they will have as many stamps. How many stamps do Xiaoming and Xiaohong have? (4 points)

5. There is a rectangle. If the width is 6 cm long, it becomes a square, and the area increases by120 cm 2. What is the area of the original rectangle? (Draw a picture first, then answer) (4 points)

6. Two baskets of oranges weigh 80 kilograms. After pouring 10kg from basket A to basket B, basket A is 2kg more than basket B. How many Jin of oranges does basket A have? (4 points)