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"Scientific Notation" data collection and organization PPT courseware
Do it:
(1) Investigate the number of books stored in a certain bookshelf in the school library. How many bookshelves are needed to hold the books in the National Library of China? Express the result in scientific notation.
(2) Survey the number of people in this school. If each person borrows 10 books, how many students in this school can the collection of books in the National Library of China be borrowed? Express the result in scientific notation.
(1) Approximately how many officers and soldiers can be accommodated in Tiananmen Square for review?
(2) If 100 million people line up in a square formation, how many Tiananmen Squares will they occupy?
Qiangqiang checked some information from the library. Please express the data in scientific notation:
1. The human brain has approximately 10,000,000,000 cells;
2. The world’s population is approximately 6.1 billion;
3. China’s forest area is approximately 128,630,000 hectares;
4. In 2002, more than 15,000 Chinese fans went to South Korea to watch the World Cup.
Can you express the original numbers represented by the following data?
The "International News" program reported the following news: The United Nations Labor Organization estimates that due to the impact of the "9.11" terrorist incident in 2001, 9×106 people in the global tourism industry may lose their jobs. The American insurance company Anbang Group believes that this terrorist incident The damage to the global economy will be as high as 1×1012 US dollars, of which the loss in the US market alone is expected to exceed 1×1011 US dollars.
summary:
What did you gain from this lesson?
1.What is scientific notation?
2. Flexibly use scientific notation, pay attention to problem-solving skills, and summarize problem-solving rules.
3. When using scientific notation to express large numbers, you should pay attention to the following points:
(1)1≤a<10.
(2) When the large number is an integer greater than 10, n is the integer digit minus 1.
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"Scientific Notation" data collection and organization PPT courseware 2:
"Scientific Notation" Data Collection and Arrangement PPT Courseware 2 Try it Xiao Ming wanted to know how the calculator represents large numbers, so he entered 1 000 and performed square calculations twice. After squaring twice, he found that an error message appeared on the calculator. As shown in the picture below, you know what it means...