Power test questions and answers of mathematical rational numbers in the first volume of the first day of junior high school I. Multiple choice questions (*** 15 small questions)
1. The average heartbeat of a normal person is 70 beats per minute, which is about 100800 times a day. 100800 is expressed as () by scientific notation.
A.0. 1008？ 106 B. 1.008？ 106 C. 1.008？ 105 D. 10.08？ 104
Scientific counting of test sites? Represents a bigger number.
Analytical scientific notation is expressed as? 10n, where 1? | a |< 10, n is an integer. When determining the value of n, it depends on how many digits the decimal point moves when the original number becomes a, and the absolute value of n is the same as the number of digits the decimal point moves. When the absolute value of the original number >; 1, n is a positive number; When the absolute value of the original number
Solution: 100800= 1.008? 105.
So I chose C.
Comment on this question to examine the representation of scientific notation. What is the representation of scientific notation? 10n, where 1? | a |< 10, where n is an integer, the key is to correctly determine the value of a and the value of n.
2.20 14 China's total GDP is 6291800 million yuan, which is expressed as () by scientific notation.
A.6.29 18？ 105 yuan B.6.29 18? 10 14 yuan
C.6.29 18？ 10 13 yuan D.6.29 18? 10 12 yuan
Scientific counting of test sites? Represents a bigger number.
Analytical scientific notation is expressed as? 10n, where 1? | a |< 10, n is an integer. When determining the value of n, it depends on how many digits the decimal point moves when the original number becomes a, and the absolute value of n is the same as the number of digits the decimal point moves. When the absolute value of the original number >; 1, n is a positive number; When the absolute value of the original number
Solution: 6291800 million is expressed by scientific notation as: 6.438+08? 10 13.
So choose: C.
Comment on this question to examine the representation of scientific notation. What is the representative of scientific notation? 10n, where 1? | a |< 10, where n is an integer, the key is to correctly determine the value of a and the value of n.
Will it be held in Hong Kong in May this year? Protect universal suffrage from violence? The signature of 12 10000 was collected in 9 days, and the general scientific notation of 12 10000 was expressed as ().
A. 1.2 1？ 106 B. 12. 1？ 105 C.0. 12 1？ 107 D. 1.2 1？ 105
Scientific counting of test sites? Represents a bigger number.
Analytical scientific notation is expressed as? 10n, where 1? | a |< 10, n is an integer. When determining the value of n, it depends on how many digits the decimal point moves when the original number becomes a, and the absolute value of n is the same as the number of digits the decimal point moves. When the absolute value of the original number >; 1, n is a positive number; When the absolute value of the original number
The general scientific notation of the solution: 12 1 is: 1.2 1? 106.
So choose: a.
Comment on this question to examine the representation of scientific notation. What is the representation of scientific notation? 10n, where 1? | a |< 10, where n is an integer, the key is to correctly determine the value of a and the value of n.
4.20 14 Jiaxing's regional GDP is 335.28 billion yuan, which is expressed as () by scientific notation.
A.33528？ 107 B.0.33528？ 10 12 C.3.3528？ 10 10 D.3.3528？ 10 1 1
Scientific counting of test sites? Represents a bigger number.
Analytical scientific notation is expressed as? 10n, where 1? | a |< 10, n is an integer. When determining the value of n, it depends on how many digits the decimal point moves when the original number becomes a, and the absolute value of n is the same as the number of digits the decimal point moves. When the absolute value of the original number >; 1, n is a positive number; When the absolute value of the original number
Solution: 335 280 000 000 is expressed in scientific notation as: 3.3528? 10 1 1.
Therefore, choose: d.
Comment on this question to examine the representation of scientific notation. What is the representative of scientific notation? 10n, where 1? | a |< 10, where n is an integer, the key is to correctly determine the value of a and the value of n.
5. The registered population of a city is 1694000, so the registered population data of this city can be expressed as () by scientific notation.
A. 1.694？ 104 person B. 1.694? 105 person C. 1.694? 106 person D. 1.694? 107 person
Scientific counting of test sites? Represents a bigger number.
Analytical scientific notation is expressed as? 10n, where 1? | a |< 10, n is an integer. When determining the value of n, it depends on how many digits the decimal point moves when the original number becomes a, and the absolute value of n is the same as the number of digits the decimal point moves. When the absolute value of the original number >; 1, n is a positive number; When the absolute value of the original number
Solution: 1694000 is expressed by scientific notation as: 1.694? 106.
So choose: C.
Comment on this question to examine the representation of scientific notation. What is the representative of scientific notation? 10n, where 1? | a |< 10, where n is an integer, the key is to correctly determine the value of a and the value of n.
In 6.20 14 years, China attracted foreign investment of 128 billion USD, becoming the largest foreign investment destination country in the world, with the scientific symbol 128 billion USD as ().
A. 12.8？ 10 10 USD B. 1.28? 10 1 1 USD
C. 1.28？ 10 12 USD D.0. 128? 10 13 USD
Scientific counting of test sites? Represents a bigger number.
Analytical scientific notation is expressed as? 10n, where 1? | a |< 10, n is an integer. When determining the value of n, it depends on how many digits the decimal point moves when the original number becomes a, and the absolute value of n is the same as the number of digits the decimal point moves. When the absolute value of the original number >; 1, n is a positive number; When the absolute value of the original number
Solution: 128 billion = 1280000000 = 1.28? 10 1 1,
Therefore, choose: B.
Comment on this question to examine the representation of scientific notation. What is the representative of scientific notation? 10n, where 1? | a |< 10, where n is an integer, the key is to correctly determine the value of a and the value of n.
7.(20 15? Shenzhen) scientific notation means that 3 16000000 is ().
A.3. 16？ 107 B.3. 16？ 108 C.3 1.6？ 107 D.3 1.6？ 106
Scientific counting of test sites? Represents a bigger number.
Analytical scientific notation is expressed as? 10n, where 1? | a |< 10, n is an integer. When determining the value of n, it depends on how many digits the decimal point moves when the original number becomes a, and the absolute value of n is the same as the number of digits the decimal point moves. When the absolute value of the original number >; 1, n is a positive number; When the absolute value of the original number
Solution: 3 16000000 is expressed by scientific notation: 3. 16? 108.
So choose B.
Comment on this question to examine the representation of scientific notation. What is the representative of scientific notation? 10n, where 1? | a |< 10, where n is an integer, the key is to correctly determine the value of a and the value of n.
8. Forbes 20 15 released the global rich list. China ranks second only to the United States. Among them, Wang Jianlin ranks first in China's rich list with a wealth of $24.2 billion, which can be expressed as () by scientific notation.
A.0.242？ 10 10 USD B.0.242? 10 1 1 USD
C.2.42？ 10 10 USD D.2.42? 10 1 1 USD
Scientific counting of test sites? Represents a bigger number.
Analytical scientific notation is expressed as? 10n, where 1? | a |< 10, n is an integer. When determining the value of n, it depends on how many digits the decimal point moves when the original number becomes a, and the absolute value of n is the same as the number of digits the decimal point moves. When the absolute value of the original number >; 1, n is a positive number; When the absolute value of the original number
Solution: 24.2 billion is expressed by scientific notation as: 2.42? 10 10.
So choose: C.
Comment on this question to examine the representation of scientific notation. What is the representative of scientific notation? 10n, where 1? | a |< 10, where n is an integer, the key is to correctly determine the value of a and the value of n.
9. The new Eurasian Continental Bridge starts from Lianyungang, China, on the west coast of the Pacific Ocean, and reaches ports such as Rotterdam, the Netherlands, on the east coast of the Atlantic Ocean in the west, crossing the central part of the Eurasian continent, with a total length of about 10900 km, and 10900 is expressed as () by scientific notation.
A.0. 109？ 105 B. 1.09？ 104 C. 1.09？ 103 D. 109？ 102
Scientific counting of test sites? Represents a bigger number.
Analytical scientific notation is expressed as? 10n, where 1? | a |< 10, n is an integer. When determining the value of n, it depends on how many digits the decimal point moves when the original number becomes a, and the absolute value of n is the same as the number of digits the decimal point moves. When the absolute value of the original number >; 1, n is a positive number; When the absolute value of the original number
Solution: 10900 is expressed by scientific notation as: 1.09? 104.
Therefore, choose: B.
Comment on this question to examine the representation of scientific notation. What is the representative of scientific notation? 10n, where 1? | a |< 10, where n is an integer, the key is to correctly determine the value of a and the value of n.
10. According to the news released on February 4, 20 14, the total grain output of Guangdong Province in 20 14 was about13,573,000 tons, and13,573,000 was expressed as () by scientific notation.
A. 1.3573？ 106 B. 1.3573？ 107 C. 1.3573？ 108 D. 1.3573？ 109
Scientific counting of test sites? Represents a bigger number.
Analytical scientific notation is expressed as? 10n, where 1? | a |< 10, n is an integer. When determining the value of n, it depends on how many digits the decimal point moves when the original number becomes a, and the absolute value of n is the same as the number of digits the decimal point moves. When the absolute value of the original number >; 1, n is a positive number; When the absolute value of the original number
Solution: 13 573 000 is expressed by scientific notation as: 1.3573? 107.
Therefore, choose: B.
Comment on this question to examine the representation of scientific notation. What is the representative of scientific notation? 10n, where 1? | a |< 10, where n is an integer, the key is to correctly determine the value of a and the value of n.
1 1. The following figures show that () is correct.
A.57000000=57？ 106
B.0.0 158 (rounded to the nearest 0.00 1)=0.0 15.
C. 1.804 (rounded to the nearest tenth) = 1.8.
D.0.0000257=2.57？ 10﹣4
Scientific counting of test sites? Represents a larger number; Divisor and significant number; Scientific notation? Represents a smaller number.
Special calculation problems.
In the analysis, the larger and smaller numbers in each item are expressed by scientific notation, and the approximate value is obtained, so as to make a judgment.
Solution: A, 57 million = 5.7? 107, error;
B, 0.0 158 (rounded to 0.00 1)? 0.0 16, error;
C, 1.804 (rounded to the nearest tenth)? 1.8, correct;
d、0.0000257=2.57？ 10 ~ 5, error,
So choose C.
Commenting on this topic, we examine the scientific notation-representing large numbers, small numbers, divisors and significant numbers. Scientific notation is expressed as? 10n, where 1? | a |< 10, where n is an integer, the key is to correctly determine the value of a and the value of n.
12. As of June 1 20 15, 34 underground warehouses have been built in Beijing, with a storage capacity of 140000 cubic meters. The scientific notation for 140000 should be ().
A. 14？ 104 B. 1.4？ 105 C. 1.4？ 106 D. 14？ 106
Scientific counting of test sites? Represents a bigger number.
Special calculation problems.
The analysis shows that 140000 is expressed by scientific notation.
Solution: 140000= 1.4? 105,
So choose B.
Commenting on this topic, we examine the scientific notation-representing large numbers, small numbers, divisors and significant numbers. Scientific notation is expressed as? 10n, where 1? | a |< 10, where n is an integer, the key is to correctly determine the value of a and the value of n.
13. The number of people taking the college entrance examination in Jiangsu Province this year is about 393,000, which can be expressed as () by scientific notation.
Point 393? 103 B.3.93？ 103 C.3.93？ 105 D.3.93？ 106
Scientific counting of test sites? Represents a bigger number.
Analytical scientific notation is expressed as? 10n, where 1? | a |< 10, n is an integer. When determining the value of n, it depends on how many digits the decimal point moves when the original number becomes a, and the absolute value of n is the same as the number of digits the decimal point moves. When the absolute value of the original number is greater than 10, n is a positive number; When the absolute value of the original number is less than 1, n is negative.
Solution: 393000=3.93? 105,
So choose C.
Comment on a number m is a? 10n( 1？ | a |< 10, where n is an integer), this counting method is called scientific notation. Law:
( 1) When |a|？ When 1, the value of n is the integer digits of a minus 1;
(2) When | 1 |
14. In a poverty alleviation activity in a city, * * * donated 5.28 million yuan, which was expressed as () by scientific notation.
A.5.28？ 106 B.5.28？ 107 C.52.8？ 106 D.0.528？ 107
Scientific counting of test sites? Represents a bigger number.
Analytical scientific notation is expressed as? 10n, where 1? | a |< 10, n is an integer. When determining the value of n, it depends on how many digits the decimal point moves when the original number becomes a, and the absolute value of n is the same as the number of digits the decimal point moves. When the absolute value of the original number is greater than 10, n is a positive number; When the absolute value of the original number is less than 1, n is negative.
Solution: 5280000=5.28? 106,
So choose a.
Comment on this question to examine the representation of scientific notation. What is the representative of scientific notation? 10n, where 1? | a |< 10, n is an integer. The key to representation is to correctly determine the value of a and the value of n.
15.20/kloc-0.5 The number of college graduates in China will reach 7.49 million, which is expressed as () by scientific notation.
A.7.49？ 107 B.7.49？ 106 C.74.9？ 105 D.0.749？ 107
Scientific counting of test sites? Represents a bigger number.
Analytical scientific notation is expressed as? 10n, where 1? | a |< 10, n is an integer. When determining the value of n, it depends on how many digits the decimal point moves when the original number becomes a, and the absolute value of n is the same as the number of digits the decimal point moves. When the absolute value of the original number >; 1, n is a positive number; When the absolute value of the original number
Solution: 7,490,000 is expressed in scientific notation as 7.49? 106.
Therefore, choose: B.
Comment on this question to examine the representation of scientific notation. What is the representative of scientific notation? 10n, where 1? | a |< 10, where n is an integer, the key is to correctly determine the value of a and the value of n.
& gt& gt& gt More about the next page? Is the first volume of Grade One a power test of mathematical rational numbers? Content of