A bar.
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2.16 with a bar on top of the 16
you just take the first 3 fours and put a line on top of it
0.16666 repeating
You know a decimal is repeating when you keep getting the same remainder and you keep adding the same decimal onto the end. On calculators it may be expressed as, as an example, 0.6666667. When writing a reoccurring (repeating) decimal it is usually expressed as one decimal with a line over the top of it.
0.7778