A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. A decimal representation does not require a decimal point.
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Lining the numbers up makes it easier to spot 0s between the decimal point and the leading non-zero digit.
No, it makes no difference.
The importance of lining up the decimals is so you can just add from bottom to top it makes things a lot easier.
When adding decimal numbers, the decimal points should be lined-up.
You will get a recurring decimal in which the recurring pattern will show up after the terminating decimal has come to an end.