Whether or not it is helpful depends on what you are trying to do!
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Yes.
It can be very helpful, so the question is inappropriate.
1. When adding, the decimals MUST line up: 012.3 +32.1 2. When multiplying, you dont have to put the decimals side by side: 12.3 x323.55 Then you count how many numbers are after the decimals, which, in this case, is three. Hope it helped!
It was 1 241 177 300 000 decimals in 2002
it affects because when you multiply you have to move the decimals to the left or right.......(helpful info)