"Ten minus 9" PPT teaching courseware for abdication and subtraction within 20

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"Ten minus 9" PPT teaching courseware for abdication and subtraction within 20

Part One: Review old knowledge and make preparations

18-6= 17-5= 14-2=

15-3= 18-5= 13-2=

13-2=

Let’s talk logic: Divide 13 into 10 and 3, 3-2=1, 10+1=11.

Ten minus 9 PPT, the second part: learning new knowledge and independent exploration

(1) Look at the diagram

Questions: 1. What information do you get from the picture?

2. What are the requested questions?

3. How to calculate the formula?

(2) Various methods to calculate ten minus nine

Method: 1. Count

Question: Can you go to the front and point to the picture and count at the same time?

2. Give it a try

3. Want to add and subtract

9+( )=15

15－9＝( )

4. Continuous reduction

15-5-4=6

Questions: (1) Where do 5 and 4 come from?

(2) Why is 9 divided into 5 and 4?

5. Break the Ten Laws

10－9＝1 5＋1＝6

Questions: (1) Who can understand this algorithm? What's the meaning?

(2) Who can demonstrate this method with pictures?

Ten minus 9 PPT, the third part: Apply new knowledge and practice independently

1. Use to put it around and do some calculations.

Question: Can you solve these two problems using your preferred method?

(The feedback focuses on adding, subtracting and breaking ten methods)

2. Go around in a circle and do the math.

Question: (1) What is the result?

(2) Why is it so circular?

11－9＝2 15－9＝6

12-9＝3 16-9＝7

13-9＝4 17-9＝8

14-9＝5 18-9＝9

Questions: 1. What other questions are there for subtracting 9 from a dozen? Can you state it and calculate the result directly?

2. Look carefully at these equations. What do you find?

3. Why is the difference of the latter question "1" more than the difference of the previous question?

Keywords: Free download of PPT courseware for mathematics in the second volume of the first grade of the People's Education Press, download of ten minus 9 PPT, download of subtraction within 20 PPT, .PPT format;

For more information about the PPT courseware "Abdication Subtraction Within 20 - Tens Subtracting 9", please click on the Abdication Subtraction Within 20 PPT Ten Tens Subtracting 9 PPT tag.

"Ten minus 9" abdication subtraction within 20 PPT download:

"Ten minus 9" PPT download of abdication subtraction within 20 Part One: Teaching purposes 1. Let students raise mathematical problems through the New Year's garden party, solve mathematical problems, and master the calculation method of ten minus 9 on the basis of understanding. 2. Through group cooperation and whole-class communication...

"Ten minus 9" abdication subtraction within 20 PPT:

"Ten minus 9" PPT on abdication subtraction within 20 Part 1: Learning objectives 1. Through exploration of the problem situation, obtain various methods of calculating ten minus 9; through comparison, experience simpler calculation methods. 2. Understand the idea of ​​abdicating subtraction from ten to nine...

"Ten minus 9" Abdication subtraction within 20 PPT courseware 4:

"Ten minus 9" Subtraction within 20 PPT courseware 4 Teaching objectives: Preliminarily master the calculation method of ten minus 9. Able to correctly perform verbal calculations of ten minus nine. Initial cultivation of students' abstract thinking ability. By thinking about addition and subtraction, we can initially penetrate the relationship between things.

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Update Time: 2024-06-17

This template belongs to Mathematics courseware People's Education Press First Grade Mathematics Volume 2 industry PPT template

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