"Multiplying Decimals by Decimals" Multiplication and Division of Decimals PPT Courseware

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"Multiplying Decimals by Decimals" Multiplication and Division of Decimals PPT Courseware

3×3=9, 4×3=12,

We can know that the product of "3.6×2.8" should be around 9. So, how should we find its accurate value? Calculated below using the vertical formula.

discuss:

1.How many decimal places are the two factors? How many decimals is the product?

2. Through comparison, what relationship do you find between the number of decimal places in the product and the number of decimal places in the two factors?

Multiply decimals by decimals,

First multiply integers to find out what the product is.

To see how many decimals there are in the factors, count them from the right side of the product and put the decimal point.

solve the real problem:

A kind of suit fabric sells for 58.5 yuan per meter. How much yuan does it cost to buy 5.2 meters of this fabric? (Estimate the number first, then calculate)

58.5×5.2=304.2(yuan)

Answer: Pay 304.2 yuan.

Thought questions:

The product of two factors is 75.2. One factor is expanded by 6 times and the other factor is reduced by 2 times. What is the product?

Summary of this lesson

1. Be able to calculate the approximate number of the product according to actual needs.

2. Be able to calculate decimal multiplication, multiplication and addition, multiplication and subtraction, and calculate decimal multiplication according to the operation laws of integer multiplication.

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For more information about the PPT courseware "Multiplying Decimals by Decimals, Multiplication and Division of Decimals", please click the Multiplying Decimals by Decimals ppt Multiplication and Division of Decimals ppt tag.

"Multiplying Decimals by Decimals" Decimal Multiplication Flash Animation Courseware 2:

"Multiplying Decimals by Decimals" Multiplying Decimals Flash Animation Courseware 2 This courseware is a teaching material for decimal multiplication in the second unit of the fifth grade mathematics volume of the Hebei Education Edition. The content is vivid and vivid. Please download it! Keywords: decimal multiplication teaching courseware,...

"Multiplying Decimals by Decimals" Decimal Multiplication PPT Courseware 4:

"Multiplying Decimals by Decimals" Decimal Multiplication PPT Courseware 4 Teaching Objectives 1. Combined with specific examples, experience the process of using existing knowledge to solve problems and learn the calculation method of multiplying decimals by decimals. 2. Understand and master the calculation methods of decimal multiplication, and be able to correctly multiply decimals..

"Multiply decimals and their estimation" Decimal multiplication PPT courseware 2:

"Multiply decimals by decimals and their estimation" Decimal Multiplication PPT Courseware 2 Tell us how many decimals the following product is: 0.194.2 5.161.3 6.370.28 24.63.2 Calculate each of the following questions orally: 0.63 490.1 80.125 500.3 3.770 1.60.2 30.254 7.60.8+0.27..

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Update Time: 2024-09-07

This template belongs to Mathematics courseware Jiangsu Education Edition Fifth Grade Mathematics Volume 1 industry PPT template

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