"Adding and subtracting whole tens with two digits" PPT

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Hebei Education Edition First Grade Mathematics Volume 2	pptx	6 MB

"Adding and subtracting whole tens with two digits" PPT

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Upload Time: 2024-10-03

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"Adding and subtracting whole tens with two digits" PPT

Part One: Classroom Training

(1) Calculate, how many apples did the kindergarten buy in total?

30+20=50 (pieces)

Add 3 tens to 2 tens to get 5 tens, which is 50.

(2) If 20 apples are given to the small class, how many apples are left?

50-20= 30 (pieces)

Subtract 2 tens from 5 tens to get 3 tens, which is 30.

Two-digit addition and subtraction of whole tens PPT, part 2 content: classroom operations

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＝

Two-digit addition and subtraction of whole tens PPT, the third part of the content: place the stick and write the calculation formula.

First place 8 bundles and 8 small sticks, and then take away 7 bundles of small sticks.

First place 8 bundles and 8 small sticks, and then take away 7 small sticks.

Think about it: What is the difference between the numbers represented by the sticks taken away twice?

Answer: The number of the sticks taken away twice is a double digit and a single digit.

Keywords: Free download of mathematics PPT courseware for the second volume of the first grade of Hebei Education Edition, two-digit addition and subtraction of integers PPT download, .PPT format;

For more information about the PPT courseware "Addition and subtraction within 100, two-digit addition and subtraction of whole tens", please click the Addition and subtraction within 100 ppt two-digit addition and subtraction of whole tens ppt tag.

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Update Time: 2024-10-03

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Addition and subtraction within 100 ppt Two-digit addition and subtraction of whole tens ppt

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"Adding and subtracting whole tens with two digits" PPT