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

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

Part One: Learning Objectives

1. Understand and master the calculation methods of simple addition and subtraction of decimals, and allow students to ask questions based on specific life situations, and be able to use the knowledge they have learned to solve some simple practical problems in life.

2. Let students experience the derivation process of decimal addition and subtraction calculation methods, develop students' ability of transfer analogy, and experience the fun of inquiry.

3. Cultivate and improve students’ computing skills, cooperation and innovation abilities.

Simple addition and subtraction of decimals PPT, part 2: import new lesson

35+98 91—29

115—87 56+23

Explore new knowledge

When calculating directly with decimals, just align the decimal points.

The same digits will be aligned, and when calculating, the previous digit must be advanced by one.

Similarities and Differences between Decimal Addition and Integer Addition

What they have in common: the digits are aligned, starting from the lowest digit, and counting to one after every ten;

Difference: Add the decimal point after calculation.

Can I omit the 0 and decimal point in front of the number?

The 0 and decimal point in front of the number play a placeholder role in vertical calculations and must be written.

Decimal addition and subtraction calculation methods

Align the decimal points, count from the lowest position, calculate according to the calculation rules of integer addition and subtraction, and finally move the decimal point down. At the same time, in addition, "full ten is added to one", and in subtraction, "full ten is added to make ten".

Issues to note when doing vertical calculations

1. The digits must be aligned. 2. Align the decimal points.

Simple addition and subtraction of decimals PPT, the third part: Consolidation and expansion

(1) 6.80-3.40=3.40 (yuan)

Answer: It’s 3.40 yuan cheaper.

(2) 6.80+3.40=10.20 (yuan)

10.20>10

Answer: Not enough.

The truck has a dead weight of 2.8 tons and a maximum load capacity of 6 tons.

Is it overloaded?

6+2.8=8.8 (tons)

8.8>8.7

Answer: Overloaded.

Simple addition and subtraction of decimals PPT, Part 4 content: Class summary

When calculating addition and subtraction of decimals, pay attention to aligning the decimal points.

Then calculate according to the integer calculation rules, and finally move the decimal point down.

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" 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...

"Simple Addition and Subtraction of Decimals" Preliminary understanding of decimals PPT download:

"Simple Addition and Subtraction of Decimals" Preliminary Understanding of Decimals PPT Download Part One: Knowledge Explanation How much does it cost to buy 1 and 1? What do you know? How do you want to solve it? 0.8+0.6=1.4 (yuan) [Method 1] Convert to integer calculation. 0..

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Update Time: 2024-10-03

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

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