"Approximate Numbers of Decimals" The meaning and properties of decimals PPT courseware 2

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"Approximate Numbers of Decimals" The meaning and properties of decimals PPT courseware 2

1. Review preparation

Read the numbers below first, and then write the numbers as required.

1. The cumulative number of visitors to the 2010 Shanghai World Expo was approximately 73.08 million. The number on the horizontal line is written as ( ), and when rewritten as the number using "ten thousand" as the unit, it is ( ).

2. The diameter of the sun is approximately 1,389,000 kilometers. The number on the horizontal line is written as ( ), and the number rounded to the nearest ten thousand is ( ).

2. Explore new knowledge

Question: Under what circumstances is it necessary to obtain approximate numbers?

Summary: For the convenience of reading and writing, numbers that are not tens of thousands or hundreds of millions are often rewritten as numbers using "ten thousand" or "hundred million" as the unit.

3. Consolidate practice

1. The following is the output of refrigerators and color TVs in my country in 2011. Rewrite each number as required.

2. Rewrite the following numbers into numbers using “hundred million” as the unit.

3. Rewrite the number on the horizontal line into a number using "ten thousand" as the unit (retain two decimal places).

4. Assign homework

Homework: Exercise 13 on page 55, questions 7 and 8.

Keywords: Courseware on the meaning and properties of decimals, PPT courseware for the second volume of the fourth grade of the New People's Education Press, fourth grade mathematics slide courseware download, PPT courseware download on the meaning and properties of decimals, .ppt format

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Update Time: 2024-10-03

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