"Multiplying Decimals by Decimals" Decimal Multiplication PPT Courseware 4

Description

"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 method of decimal multiplication, and be able to correctly perform decimal multiplication calculations.

3. In the process of using existing knowledge to understand calculation methods, understand the connection between knowledge and build self-confidence in learning mathematics well.

review review

( )×100＝523

2.5×( )=25

3.142×1000＝( )

1.2×( )=12

5.22×100＝( )

( )×10＝654

(1) The living room of Congcong’s family is 4.8 meters long and 3.6 meters wide. What is the area of ​​the living room in square meters?

4.8×3.6＝_____(square meters)

What does the number of decimals and the product of two factors have to do with each other?

Calculation check: Swap the positions of the factors and multiply again.

(2) The width of the coffee table is 0.45 meters. What is the area of ​​the coffee table in square meters?

0.45×0.9＝_____(square meters)

(3) The width of the sofa in the living room is 0.85 meters. How many square meters does the sofa occupy?

1.8×0.85＝_____(square meters)

Discuss

How to calculate decimal multiplication?

To calculate decimal multiplication, first calculate the product according to the rules of integer multiplication, then look at how many decimals there are in the factors, count them from the right side of the product, and click on the decimal point.

practice

1. Use vertical calculation first, and then check with calculator.

3.7×0.9 0.86×0.12

1.21×0.17 0.74×2.5

12.5×0.8

0.25×1.2

2. There is a landscape painting on the wall of Congcong's living room. It is 2.2 meters long and 1.95 meters wide. What is the area of ​​this painting in square meters?

2.2×1.95=4.29 (square meters)

Answer: The area of ​​this painting is 4.29 square meters.

3. Congcong’s bedroom is 4.85 meters long and 3.34 meters wide. What is the area of ​​Congcong's bedroom in square meters?

4.85×3.34＝16.199 (square meters)

Answer: The area of ​​Congcong’s bedroom is 16.199 square meters.

4. After Zhang Hong saw lightning in the distance, he heard thunder after 4.6 seconds. If the propagation speed of thunder in air is 0.34 kilometers/second, how far is the place where the lightning struck from Zhang Hong? (The time from when the flash occurred to when the flash occurred is omitted)

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

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Update Time: 2024-10-20

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

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