1 and 249005024 are composed of () billion and () million. 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, and □ can fill in () at most.
5. When calculating 2 160 ÷ 20-57 with a calculator, press 2 160 on the keyboard, then press ÷, then press 20, and then press ÷-. At this point, the screen should display (). 6. A five-digit number rounded to 10000 is 80000, and the maximum value of this five-digit number is (.
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 the digits of each digit of this new number is 3, and the original number is ().
Three. Omit the mantissa after the highest digit, and then write the approximate number. (4 points)
19504 96025 349910020 iv. Write the approximate values of the following numbers in units of "ten thousand". (4 points)
739865954019802501005000 V. Selection. (2×5= 10)
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", you should read () 0. A.4B.3C.2D.54 and 4: 30, the angle formed by the minute on the clock face and the hour hand is () angle A, right angle B, obtuse angle C, acute angle D, flat angle.
5. Calculate 85 1÷23, and take 23 as 20 test quotients. At first, (). A is just B. too big C. too small D. impossible to judge.
Calculation of intransitive verbs. (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?
Master Wang produced 640 parts in 8 hours, while 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
4. Students visited the Science and Technology Museum, 45 students went to the fourth grade, and the number of students going to the fifth grade was three times that of the fourth grade. 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 13 days in June 5438+02. 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,