"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)

Keywords: decimal multiplication teaching courseware, decimal multiplication teaching courseware, Hebei Education Edition fifth grade mathematics volume PPT courseware download, fifth grade mathematics slide courseware download, decimal multiplication PPT courseware download, decimal multiplication PPT courseware download, .PPT format;

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.

"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,...

"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..

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

"Multiply decimals by decimals and their estimation" Decimal multiplication PPT courseware What is the area of ​​the two blackboards? How to list the calculation formula? 1. Classroom blackboard 3.1X1.2=? 2. Playground blackboard 31X1.2=? Which calculation formula have we learned? What are their differences? Depend on..

File Info

Update Time: 2024-11-21

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

Preview