"Changes in the size of decimals caused by the movement of the decimal point" PPT courseware on the meaning and properties of decimals

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People's Education Press fourth grade mathematics volume 2	pptx	6 MB

"Changes in the size of decimals caused by the movement of the decimal point" PPT courseware on the meaning and properties of decimals

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Upload Time: 2024-09-17

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"Changes in the size of decimals caused by the movement of the decimal point" PPT courseware on the meaning and properties of decimals

1. Conversations and exchanges to reveal topics

(1) Conversation introduction and introduction of new lessons

Below are the height and weight data of three classmates recorded by Ma Xiaohu during the physical examination of fourth grade students. Please take a look.

(2) Observe data and trigger thinking

2. Create situations and explore patterns

(1) Tell stories

Question: Let’s collect relevant mathematical information while listening to the story and see what happened to the length of Sun Wukong’s golden cudgel.

(2) Explore the relationship between the movement of the decimal point and the change in the size of the decimal

Decimal point to the right

Moving one position is equivalent to multiplying the original number by 10, and the decimal is expanded to 10 times the original number;

Moving two places is equivalent to multiplying the original number by ( ), and the decimal is expanded to ( ) times the original number;

Moving three digits is equivalent to multiplying the original number by ( ), and the decimal is expanded to ( ) times the original number;...

3. Consolidate practice and deepen understanding

1. Expand the following numbers to 10 times, 100 times, and 1000 times respectively.

2. Reduce the following numbers to their original numbers ( ), ( ), and ( ) respectively.

3. If 6.25 is rewritten as the following number, how will its magnitude change?

4. Assign homework

Homework: Exercise 11 on page 46, questions 3 and 4.

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

For more information about the PPT courseware "The Meaning and Properties of Decimals: Changes in the Size of Decimals Caused by Moving the Decimal Point", please click on the ppt tag of "The Meaning and Properties of Decimals: Changes in the Size of Decimals Caused by Moving the Decimal Point".

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Update Time: 2024-09-17

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"Changes in the size of decimals caused by the movement of the decimal point" PPT courseware on the meaning and properties of decimals