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That is because if you don't, you will get the wrong answer. It is ALWAYS important to LINE up the decimals.
It is important for you to line up the decimals vertically the way I did above so that you can keep track of the place-value position of the digits.
because
Because in India, there are children who get no slopes at all with their lines.
Without it, there would be an impossible to explain gap in the number line between 49.999999... and 51.000000...