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The main difference is that with whole numbers the decimal point is "hiding" (after the last digit of each whole number) whereas with decimal numbers it is clearly visible.
In both cases the numbers are added with the decimal points aligned - with whole numbers there are no digits after the decimal points so the decimal points are not written, but if they were they would be visible after the last digit of the whole numbers and they would be automatically aligned; with decimal numbers there may be a different number of digits after each decimal point so it is up to the person doing the arithmetic to ensure the decimal points are aligned.
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What are the multiples of 0.4?
Multiples refer to whole numbers, not decimals.
Why do you line up the decimal when adding or subtracting decimal numbers?
Yes, When Adding and Subtracting decimals you should line up the decimals. You need to keep each place value in the same column, the same as when you add whole numbers you keep the ones column lined up, same for the tens, etc. Lining up the decimal points makes sure that the tenths column is kept together, same for the hundredths, and so on.
How does interpreting decimals as fractions help you make sense of adding and subtracting decimals?
Decimals are fractions. Fractions are easy to picture graphically. Considering them in a concrete fashion makes the basic operations of addition and subtraction easy to visualize.
What is the first step when you are adding and subtracting decimals?
Write them one above the other with the decimal points aligned.
What two decimals are equivalent to 0.8?
There are an infinite number of decimals that are all equal to 0.8 . They are formed by adding as many zeros as you want to, after 0.8 . Examples: 0.80 0.800 0.8000 . . etc.
