"Add and Subtract Whole Tens" PPT teaching courseware for addition and subtraction within 100

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"Add and Subtract Whole Tens" PPT teaching courseware for addition and subtraction within 100

Part One: Review Import

Do the math.

Let's see who can calculate correctly.

2+3＝6-2＝

5＋4＝7－4＝

3+4＝ 9-4＝

What are the teachers and students in the picture doing?

PPT on adding and subtracting whole tens to whole tens, part 2: exploring new knowledge

What mathematical questions can you ask by looking at the picture?

How many books are there in total?

How to solve this problem?

10＋20＝?

What other questions could be asked?

There are 30 books in total. There are 20 books on the right. How many books are on the left?

How to list it?

30-20=?

How do you calculate it?

I used the method of placing small sticks to help calculate.

Adding and subtracting whole tens to ten PPT, the third part: corresponding exercises

1. Look at the diagram.

Looking at the picture, you can list addition equations or subtraction equations.

40＋20＝

60-20＝

60-40＝

2. Do the math.

3＋2＝ 4＋5＝

30＋20＝ 40＋50＝

6-4＝ 7-3＝

60-40＝ 70-30＝

What did you find?

I discovered that to add or subtract whole tens, just add and subtract the numbers in the tens place.

Adding and subtracting whole tens PPT, part 4 content: Class summary

When calculating the addition of integers to integers, you can regard the integers as the sum of several tens; you can also add the numbers before 0 first, and then add a 0 at the end of the calculation result, that is The result of the calculation.

To calculate and subtract an integer from an integer, you must treat the integer as several tens, and then subtract the several tens; you can also calculate by subtraction within 10 first, and then add a 0 at the end of the resulting number, that is Get the calculated result.

Keywords: Free download of PPT courseware for mathematics in the second volume of the first grade of the People's Education Press, download of PPT of addition and subtraction of whole tens, download of PPT of addition and subtraction within 100, .PPT format;

For more information about the PPT courseware "Addition and subtraction within 100, adding and subtracting whole tens, adding and subtracting whole tens", please click the Addition and subtraction within 100 PPT, adding and subtracting whole tens PPT tag.

"Adding and subtracting whole tens" Addition and subtraction within 100 PPT courseware download:

"Add and Subtract Whole Tens" PPT courseware download for addition and subtraction within 100 Part One Content: Learning Objectives 1. Make full use of the materials provided in the textbook and the method of placing sticks to guide students to understand and master the addition and subtraction of whole tens How to calculate decimals. 2. Cultivate...

"Adding and subtracting whole tens" PPT download of addition and subtraction within 100:

"Adding and subtracting whole tens" PPT download of addition and subtraction within 100 Part One: Review introduction 1. Review addition and subtraction within 10. 3+2= 2+7= 4+5= 3+4= 7+3= 9-4= 6-3= 8-2= 2. Review the composition of numbers. (1)8..

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Update Time: 2024-11-15

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

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