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Authoritative PPT Summary
"How Big is 100 Million" Number Recognition PPT Courseware
90000000÷60=1500000(minutes)
1500000 ÷60=25000(hour)
25000÷24≈1042(days)
1042÷365≈2.9(days)
Activity three:
(1) There are about 1.3 billion people in our country. If each person saves one grain of rice per day, how many grams of grain can be saved in the country per day?
2500000×13=32500000 (grams)
(2) If each person eats 400 grams of rice per day, how many days can the saved rice last for one person? Approximately how many years?
32500000÷400=81250 (days)
81250÷365≈223 (years)
1. Asia is severely short of water. About 800 million people lack drinking water that meets hygienic standards. There are approximately 2 billion people who cannot use sanitation facilities due to lack of water. In 20 years, the number of people in the world suffering from water shortages may reach 3 billion.
2. One hundred million children holding hands can circle the earth's equator three and a half times. (The Earth’s equator is 40,000,000 meters)
3. If a person can live to be 80 years old, measured in billions, his life will last only more than 2.5 billion seconds; for a centenarian, the life span will be 3.1 billion seconds.
4. There are about 1,000 students in our school. If each student is given 20 books per school year, then 100 million books will be enough for 5,000 years.
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"How Big is 100 Million" PPT courseware for understanding big numbers:
"How Big is 100 Million" PPT courseware for understanding big numbers. It will take about 3 years to count 100 million non-stop. People have to eat and sleep. If you count 100 million for 8 hours a day, it will take () years. In other words, you are 9 years old this year. If you start counting from now on, you will have to count to ( ) years old to...