1, 249005024 consists of () million pieces and () million pieces. Reading and writing () is about () million in "ten thousand" and about () million in "hundred million".
The five numbers 2, 2, 3, 4, 7 and 5 make up the largest number () and the smallest number ().
3. Starting from one digit, the seventh digit is (), and the counting unit is ().
4.49 □ 785 ≈ 500,000, the maximum amount of □ can be filled in ().
5. When calculating 2 160 ÷ 20-57 with a calculator, press 2 160 on the keyboard, then press ÷, then press 20, and then press ÷-to display the screen (). 6. Five digits are rounded to10,000, and the digit is 80,000. The maximum value of this five-digit number is () and the minimum value is (). 7. "Little careless" miscalculated 28×(□+2) as 28×□+2, so the result is different from the correct answer ().
8.□÷2 1 = 35 ...△, where the maximum value is (), then □ is ().
9. There is a seven-digit number, and the number of digits of each number is 5. If you add 2 to this number, you will get a new seven-digit number. At this point, the sum of digits in this new number is 3, and the original number is ().
Third, omit the mantissa after the highest digit of the following number, and then write the approximate number. (4 points)
19504 96025 349910020 IV. Write the approximate values of the following figures in units of "ten thousand". (4 points)
739865954019802501005000 V. Selection. (2×5= 10 point)
1, 25×28= ().
a . 25×20×8 b . 25×20+8 c . 25×4×7d . 5×(5×28)
2. The endpoint of the line segment is ().
A.1b.2c. There is no D. It is countless.
3. When reading "200708090", read () zero. A.4b.3c.2d.5 At 4 o'clock and 4: 30, the angle formed by the minute hand and the hour hand on the clock face is (). A. right angle B. obtuse angle C. acute angle D. flat angle
5. Calculate 85 1÷23, and take 23 as 20 test quotients, starting from (). A. It's just that B. It's too big, C. It's too small, D. It's impossible to judge
Sixth, calculation. (12)
735÷ 15×6 800-600÷20 18×(537-488)
26×8× 125 4200÷ 15÷2 25×33×4
Seven, the application problem (35 points)
1. There is a pile of wheat weighing 2530 kilograms on the threshing sound. How many bags do you need if 25 kilograms are packed in one bag?
2. Master Wang produced 640 parts in 8 hours, and Li Shifu produced 520 parts in 4 hours. How many parts does Master Wang produce less per hour than Li Shifu?
Mom took 50 yuan to the supermarket, bought three bottles of cooking wine at 8 yuan each, and then used the remaining money to buy milk powder. Milk powder per bag 12 days. Is it enough to buy three bags?
The students visited the Science and Technology Museum. There are 45 students in grade four, and the number of students in grade five is three times more than that in grade four. 12. How many people are in the second grade?
5. A sprinkler travels 50 meters per minute, and the sprinkling width is 6 meters. How many floors can a sprinkler sprinkle for 23 minutes?
6. A factory produces white sugar 18 days and brown sugar 12 months 13 days. White sugar 16 tons and brown sugar 12 tons can be produced every day. How many tons of white sugar is more than brown sugar? List the conditions first, then answer.