"Simple Addition and Subtraction of Decimals" Preliminary Understanding of Decimals PPT Courseware 3

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"Simple Addition and Subtraction of Decimals" Preliminary Understanding of Decimals PPT Courseware 3

Think about it:

What are the similarities between adding and subtracting decimals and adding and subtracting integers? What should you pay attention to?

When calculating the addition and subtraction of decimals and the addition and subtraction of integers, numbers in the same digits are added and subtracted, starting from the lowest digit, and the same method of "advancing a full ten to one" or "returning one to make a ten" is only a decimal. Pay attention to aligning the decimal points when doing addition and subtraction.

discuss:

1. What should we pay attention to in vertical calculations of decimal addition and subtraction?

2. When calculating addition and subtraction of decimals, why do we need to align the decimal points? Where should this decimal point be?

3. What are the similarities between adding and subtracting integers and adding and subtracting decimals?

Calculation rules for adding and subtracting decimals

To calculate the addition and subtraction of decimals, first align the decimal points of each number (that is, align the numbers in the same digit), then perform the calculation according to the rules of integer addition and subtraction, and finally align the decimal points on the horizontal line in the resulting number. ．

To calculate the addition and subtraction of decimals, first align the decimal points of each number (that is, align the same digits), then perform calculations according to the addition and subtraction rules of integers, and finally align the decimal points on the horizontal lines in the resulting numbers.

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"Simple Addition and Subtraction of Decimals" Preliminary Understanding of Decimals PPT Courseware 2:

"Simple Addition and Subtraction of Decimals" Preliminary Understanding of Decimals PPT Courseware 2 Use vertical calculation: 32+54= 68-27= 48+9= 25-17= 1. Align the same digits and add and subtract starting from the ones digit. 2. Which one adds up to ten, add 1 to the previous one, and which one does not add up enough, add 1 to the previous one..

"Simple Addition and Subtraction of Decimals" PPT courseware for preliminary understanding of decimals:

"Simple Addition and Subtraction of Decimals" Preliminary Understanding of Decimals PPT Courseware Think about it: What are the similarities between the calculation of addition and subtraction of decimals and the calculation of addition and subtraction of integers? What should you pay attention to? When calculating addition and subtraction of decimals and addition and subtraction of integers, numbers in the same digits are added together...

"Simple Addition and Subtraction of Decimals" Preliminary understanding of decimals Flash animation courseware:

"Simple Addition and Subtraction of Decimals" Flash animation courseware for preliminary understanding of decimals. This courseware helps students learn the knowledge points of simple addition and subtraction of decimals in the preliminary understanding of decimals in the form of exercises. It summarizes the knowledge points of this lesson. It is to consolidate knowledge points..

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Update Time: 2024-09-16

This template belongs to Mathematics courseware Jiangsu Education Edition Third Grade Mathematics Volume 2 industry PPT template

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