I. Fill in the blanks (20 points) ★★

1, from the unit point of view, one hundred thousand bits are () bits, the counting unit on the ninth bit is (), and the fourth bit is "3", which means ().

2.50,890,000 kg is pronounced as (), and it is rewritten as "10,000" in ().

How to write 3,300,609 meters ().

4. The number of A is 5600, which is 80 times that of B. The difference between A and B is ().

5. In the addition formula, △+δ =□, if △+δ+□ = 180, then □ = ().

6, 28 times a number, the product is 504, and this number is ().

7, the largest six digits is less than the smallest seven digits ().

8. The largest five digits consisting of 0, 4, 8, 9 and 6 are () and the smallest five digits are ().

9.804-297 After simplification, it can be converted into 804× () () to calculate.

When 10 and 364+60 1 are simplified, they can be converted into 3640× () to calculate.

II. Judgment (***5 points)

The product of () 1 and 450 × 280 has two zeros at the end.

() 2. The forward speed between every two counting units is 10.

() 3.723460 The mantissa after omitting ten thousand digits is about 72.

() 4,7 □ 268 ≈ 70,000, □ can be 4 at most.

() 5. Multiply two digits by three digits, and the product may be five digits or four digits.

Three. Calculation (***38 points)

1, oral calculation (6 points)

680+320= 120× 300= 640- 150= 302+ 169=

450,000-360,000 = 350+270= 480÷30= 200×27=

0 ÷ 287 = 288-99 =15+8-15+8 = 3.7 million+630,000 =

2. Vertical calculation: 3, 4. Check the requirements of small questions (12 points)

26357+8856= 64300- 1385= 174×205= 240×2300=

Simple calculation (12 points)

144+ 198 45×5×4 250- 199 490÷ 14

Four, text questions (***9 points)

1, what number subtracts 542 to get 42? (the solution of an equation whose column contains unknown x)

2, 97 plus 240 times 25, what is the product?

What is 3.80 125?

Five, solve the problem (***28 points. 1 question 3 points, the remaining 5 points)

1. A car travels 45 kilometers per hour. The speed of a rocket is 392 times that of a car. How many kilometers does the rocket fly per minute?

A factory will produce 33,500 parts. It was originally planned to manufacture 265,438+08 pieces per day, and it actually took 65,438+025 days to complete the plan. How many more parts are actually produced every day than originally planned?

The store sent a batch of yogurt, sold 32 pieces, and left 28 pieces. How much yogurt did the store send?

4. A village has 65,438+002 households. After cooking with solar cookers, each household can save electricity 12 degrees per month. According to this calculation, how many kWh can be saved in a year?

5. The grain store delivered 168 bags of rice, 35 kg each. Part of it was sold, leaving 42 bags. How many kilograms did you sell?

6. Miss Li spent 139 yuan on books, 97 yuan on sports equipment and 300 yuan money with her. How much money is left now?