"Adding and subtracting whole tens and whole hundreds" PPT courseware 2

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"Adding and subtracting whole tens and whole hundreds" PPT courseware 2

Calculate the following questions orally.

70+20= 80-50= 35+15=

70+80= 800-200= 870-70=

300+400= 1000-600= 720-200=

It can be calculated as 500+400. If 500+400 is also 900, it means the calculation is correct.

You can calculate 900-400 to see if you can get 500. If you get 500, it means you calculated it correctly.

When we calculate, we need to judge whether our calculation is correct or not, and we can check it. To check whether the addition calculation is correct, we can calculate it again, or we can exchange the positions of the addends and calculate it again, or we can subtract one addend from the sum to see if we can get another addend. Carry out inspection. When children are calculating, they must develop a good habit of checking calculations in order to improve the accuracy of calculations.

To check whether the calculation of 600-400 is correct, we can use the method of calculating 600-400 again, or we can use 600-200 to see if we can get 400, or we can use 200+400 to see if we can get 600. Any of these methods can be used Check whether the subtraction calculation is correct. Children can choose their favorite method for testing when calculating, and they should develop good habits of testing.

1. Enable students to further master the calculation methods of addition and subtraction of whole tens and whole hundreds, and be able to perform calculations correctly.

2. Combined with specific situations, let students understand and master the testing methods of addition and subtraction, feel the importance of testing, and develop good habits of conscious testing.

Keywords: PPT courseware on addition and subtraction of whole tens and whole hundreds, download of Western Normal University version second grade mathematics PPT courseware, second grade mathematics slide courseware download, download of PPT courseware of addition and subtraction of whole tens and whole hundreds, .PPT format

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"Adding and subtracting whole tens and whole hundreds" PPT courseware 3:

"Addition and Subtraction of Whole Tens and Whole Hundreds" PPT Courseware 3 How much does it cost to buy an upper berth and a lower berth in the third class cabin? Use three digits plus three digits. How else can it be calculated? Starting from 80, count one by one, 90, 100, 110, 120, 130. ... ...

"Addition and Subtraction of Whole Tens and Whole Hundreds" PPT courseware:

"Adding and subtracting whole tens and whole hundreds" PPT courseware 8 tens plus 5 tens equals 13 tens, which is 130. There are 8 bags plus 5 bags, a total of 13 bags, each bag contains 10, so 13 tens is 130. Start at 80 and continue counting: 90, 100, 110, 120, 130. From 50...

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Update Time: 2024-10-02

This template belongs to Mathematics courseware Western Normal University Edition Second Grade Mathematics Volume 2 industry PPT template

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