Before decimal = ones
After decimal = tenths
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the decimal point came from the middle ages. before - was printed a man decided to place a point in between two numbers then decided to call it the decimal.
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42.9, honey. Just round that bad boy to one decimal place and call it a day. No need to overcomplicate things, darling.
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. So the required decimal representation is 541, exactly as in the question.
Well, honey, in the decimal 0.45, the value of the 4 is 4 tenths. So, if you want to get all technical, you can say the value of 4 is 0.4. But really, who's got time for all those extra zeros? Just call it like it is and move on.