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

Description

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

Part One Content: Knowledge Explanation

Buy 1 piece and 1 tube, how much is the total?

What do you know? How do you want to solve it?

0.8+0.6=1.4 (yuan)

[Method 1] Convert to integer calculation.

0.8 yuan = 8 cents

0.6 yuan = 6 cents

8 cents + 6 cents = 14 cents = 1.4 yuan

Answer: A total of 1.4 yuan.

[Method 2] Calculate with the help of the relationship between yuan, angles and minutes.

First calculate 8+6, which means the sum of 8 jiao and 6 jiao is 1 yuan and 4 jiao. Write 4 in the digit of the angle and advance 1 to the digit of the yuan.

Finally, count 0+0, plus carry 1, for a total of 1 yuan, and write 1 to the digit of the yuan.

How to calculate decimal addition in vertical form?

Align the same digits and add them up from the last digit. Which digit adds up to ten, advance 1 to the previous digit, and click the decimal point at the end.

Simple addition and subtraction of decimals PPT, part 2: practice and consolidation

Column vertical calculation.

When calculating, you must pay attention to aligning the same digits, that is, aligning the decimal points.

0.8＋1.2＝ 2.6－1.8＝

3.5-0.7= 2+1.8=

Fill in ○ with ">", "<" or "=".

0.7＋1.3○1.9 0.8＋0.7○1.3+0.4

4.2○6-1.8 2-1.2○0.9

5○2.2+2.8 2.2+1.8○4.1

Simple addition and subtraction of decimals PPT, the third part: knowledge summary

When writing decimal addition (subtraction), align the decimal points, that is, align the same digits; count from the last digit; add 1 to the decimal point (if the subtraction is not enough, go back 1 to the previous digit).

after class homework

Questions 1 and 3 on page 98 of the textbook

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: 2024-10-15

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

Preview