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

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"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. Whichever sum is full, you need to add 1 to the previous one, and whichever sum is not enough, you need to step back 1 and then subtract from the previous one.

discuss

1. What should we pay attention to in vertical calculation of decimal addition?

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

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

To calculate decimal addition, first align the decimal points of the addends (that is, align the same digits), and then perform the calculation according to the calculation rules of integer addition. The decimal point in the resulting number must be aligned with the decimal point in the addend.

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Update Time: 2024-11-18

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