"Simple addition and subtraction of decimals" Preliminary understanding of decimals PPT

Description

"Simple addition and subtraction of decimals" Preliminary understanding of decimals PPT

Part One: Learning Objectives

1. Experience the formation process of calculation methods for addition and subtraction of decimals, and experience the arithmetic and algorithms of decimal addition and subtraction.

2. Through group cooperation and communication and other activities, cultivate students’ awareness of mathematical applications and cooperation and communication.

3. By creating life-like situations, students can feel the close connection between mathematics and life, and cultivate students' mathematical emotions and good qualities of unity and cooperation.

[Key Points] Master the calculation methods of decimal addition and subtraction, and understand that "decimal point alignment" means aligning the same digits.

[Difficulty] Experience arithmetic during the calculation process and deepen your understanding of addition and subtraction of decimals.

Simple addition and subtraction of decimals PPT, part 2 content: course analysis

Compare to see who can calculate correctly and quickly.

Tell me how you calculated it?

When the column is in vertical position, the relative digits are aligned.

When calculating addition, starting from the ones digit, whichever digit is full of ten should be advanced to the previous digit with "1"; when calculating subtraction, starting from the ones digit, whichever digit is not enough to be subtracted, should be stepped back by "1" from the previous digit. ".

Addition of decimals:

What information did you learn? What problem needs to be solved?

How much does it cost to buy these two items?

Simple addition and subtraction of decimals PPT, Part 3: Classroom exercises

1. Calculate the following questions.

2. Compare to see who can fill in the form correctly and quickly.

3. (1) How much cheaper is "Use Your Brain" than "Selected Fairy Tales"?

6.8-3.4＝3.4 (yuan)

Answer: "Use Your Brain" is 3.4 yuan cheaper than "Selected Fairy Tales".

(2) Is 10 yuan enough to buy one book each?

6.8+3.4=10.2 (yuan)

10.2 yuan＞10 yuan

Answer: 10 yuan is not enough to buy 1 book each.

4.Did you know?

In ancient my country, small sticks were used to represent numbers. To represent a decimal, place the number after the decimal point one space lower. For example, place 3.12 as shown on the right.

This is the world's earliest decimal representation method.

In the West, decimals appeared much later. The first person to use a small dot as a decimal point was the German mathematician Clavius.

How to calculate decimal addition and subtraction:

When calculating the addition and subtraction of decimals in vertical format, first align the decimal points of each number, and then perform calculations according to the rules of addition and subtraction of integers.

The decimal point in the number must be aligned with the decimal point on the horizontal line.

Keywords: free download of PPT courseware for mathematics in the second volume of the third grade of the People's Education Press, simple addition and subtraction of decimals PPT download, preliminary understanding of decimals PPT download, .PPT format;

For more information about the PPT courseware "Preliminary Understanding of Decimals and Simple Addition and Subtraction of Decimals", please click on the PPT tag of "Initial Understanding of Decimals and Simple Addition and Subtraction of Decimals".

"Simple Addition and Subtraction of Decimals" Preliminary Understanding of Decimals PPT (Lesson 2):

"Simple Addition and Subtraction of Decimals" Preliminary Understanding of Decimals PPT (Lesson 2)

Part One: Learning Objectives

1. Go through the problem-solving process and learn to solve problems using the knowledge of comparing the sizes of decimals, addition and subtraction of decimals.

2. By solving specific problems..

"Simple Addition and Subtraction of Decimals" Preliminary Understanding of Decimals PPT (Lesson 1):

"Simple Decimal Addition and Subtraction" PPT on Preliminary Understanding of Decimals (Lesson 1) Part One Content: Learning Objectives 1. Understand and master the calculation methods of simple decimal addition and subtraction, and let students ask questions based on specific life situations, and be able to Use the knowledge you have learned to solve student...

"Simple Addition and Subtraction of Decimals" PPT teaching courseware for preliminary understanding of decimals:

"Simple Addition and Subtraction of Decimals" PPT teaching courseware for preliminary understanding of decimals Part 1: Introduction of the topic 1. What do you see in the picture? Ask some math questions? [Answer] The price of the eraser is 0.8 yuan. The price of the stationery bag is 6.8 yuan. School bag...

File Info

Update Time: 2024-10-20

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

Preview