Underlining is used in questions asked about decimals, not in decimal notation.
A bar across the top of a decimal number means that the number (or numbers) are repeated infinitely as the decimal equivalent of a fraction, such as 1/3 (0.3333) or 1/7 (0.142857142857142857).
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None of the digits are underlined. If one of them was underlined, the answers would be (from left to right) 600, 580, 582, 582.1, 582.09 and 582.091 respectively.
Standard algorithm is when you take two digits or decimals and you put the digit or decimal with the greater value on top and the digit or decimal with the least value on the bottom and you contrast the digits/decimals to see if it greater than, less than,or equal to.
as many as needed to satisfy the accuracy needed.
They are decimal representations of numbers which stop after a finite number of digits (or continue with an infinite string of 0s).
There is an infinite amount of decimals between 0.1 and 0.11. Write "0.10", and then add any digit or digits you like - the result will be between those two.