"The Meaning of Decimals" The meaning and properties of decimals PPT courseware

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"The Meaning of Decimals" The meaning and properties of decimals PPT courseware

1. Create situations and reveal topics

Questions: 1. Do you have any thoughts on the questions raised by the elf? Default: expressed as complex numbers, fractions or decimals.

2. Where have you seen decimals used in life?

Summary: When performing measurements and calculations, it is often not possible to obtain exactly integer results, and decimals are often used to express them.

2. Study rewriting methods and explore the meaning of decimals

(1) Preliminary exploration into the rewriting of one decimal place

Questions: 1. Divide 1 meter into 10 equal parts. Can you express 1 part using fractions or decimals?

2. What does 0.1 mean? What other part of the diagram represents 0.1?

(2) Analyze and understand the rewriting of two decimal places

Question: 1. Divide 1 meter into 100 parts, how to express 1 part as a fraction? How to express it as decimal?

2. How can the scales pointed by the second and third red arrows be represented by fractions and decimals respectively?

Summary: A fraction with a denominator of 100 can be written with two decimal places, which is just a few 0.01.

(3) In-depth and flexible understanding of rewriting to three decimal places

(4) Summary

Summary: We can rewrite fractions whose denominators are 10, 100, 1000... into decimal form, making it more convenient and simple for people to apply.

3. Consolidate the meaning and understand counting units and progress rates

(1) Apply feelings and consolidate meaning

(2) Understand the counting units and progression rates of decimals

Questions: 1. What counting units do we know in the process of learning integers? What's the relationship between them?

2. 1 one is 10 ( ); 1 tenth is 10 ( ); 1 hundredth is 10 ( );…

Summary: The counting units of decimals are one-tenth, one-hundredth, one-thousandth...

Written as 0.1, 0.01, 0.001... respectively

The advance rate between each two adjacent counting units is 10.

4. Introduce the history of decimals and expand your horizons

5. Assign homework

Homework: Exercise 9 on page 36, Questions 1 and 2.

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: 2024-10-20

This template belongs to Mathematics courseware People's Education Press fourth grade mathematics volume 2 industry PPT template

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