Because left of the decimal point goes times 10 for every position and right of the decimal point goes times -10 for every position.
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you only line the decimals up when you are subtracting or adding not when you are multiplying im not sure about division...
Adding and subtracting decimals is easy. When you put the numbers one above the other, line up the decimals vertically and treat as you would any whole number just keep the decimals in line and bring it straight down to your answer.
line up the decimal point when your adding and subtracting. add annex a zero when you have extra number. sometimes you can use a number line.
3rd. Adding Decimals 5th - Adding and subtracting 6th - Dividing Decimals
no