"Library" Addition and Subtraction PPT Courseware

Description

"Library" Addition and Subtraction PPT Courseware

Part One Content: Knowledge Explanation

How many copies are there in total for example and ?

28+4=

Do you have a different algorithm?

Calculate first 8+4=12

20+12=32

Give it a try with a small stick.

First use a counter to calculate

The ones' position adds up to ten, and one is added to the tens' place.

In the vertical format, pay attention to aligning the same digits.

Counting from the ones digit, the ones digit adds up to ten, and advances to the tens digit.

summary

When calculating with a counter, count from the ones digit and proceed to the nearest ten.

When arranging the columns vertically, the same digits should be aligned.

In vertical calculations, counting from the ones digit, carry one to every ten, and the carry 1 is written in the lower right corner of the tens digit.

Library PPT, Part 2: Practice and Consolidation

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

You can first calculate 5+8=13

Then calculate 30+13=43

You can also calculate 35+5=40 first

Then calculate 40+3=43

2. Do the math in vertical form.

58＋7 = 5＋32 = 38＋6 = 8＋27 =

3. How many did Brother Rabbit pick?

I picked 8 more than my sister.

Mom, I picked 37.

37+8=45 (pieces)

Answer: Brother Rabbit picked 45.

Library PPT, the third part: knowledge summary

Vertical calculations should be remembered.

Eyes can clearly see addition and subtraction,

The same digits must be aligned,

Starting from the ones position on the right,

If the one position reaches ten, then one should be added.

library

When calculating the carry addition of a two-digit number plus a one-digit number in column-vertical form, you should pay attention to:

1. The same digits must be aligned;

2. Count the ones digit first, and then go to the previous digit by one if it reaches ten;

3. See the operation symbols clearly.

Keywords: Free download of Beijing Normal University Edition first-year math PPT courseware for the second volume, library PPT download, addition and subtraction PPT download, .PPT format;

For more information about the "Adding and Subtracting Library" PPT courseware, please click the Adding and Subtracting PPT Library PPT tab.

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Update Time: 2024-11-10

This template belongs to Mathematics courseware Beijing Normal University Edition First Grade Mathematics Volume 2 industry PPT template

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