Line up the decimal points in a vertical column. Then add the numbers while ignoring the decimal point. Finally, put a decimal point in the answer in the same column as for the summands.
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They aren't. The rules are the same as those for adding/subtracting or multiplying integers. Just be careful of the decimal point's location.
When adding decimal numbers, the decimal points should be lined-up.
Decimal addition is adding numbers that are represented in decimal form.
No, it makes no difference.
If there are any numbers which are integers and so do not have a decimal point, then append one at the extreme right. Then arrange all the numbers in a column, with their decimal points aligned. Ad up the numbers ignoring the decimal points entirely. In the answer insert a decimal point under the column of decimal points.