2.3 repeating is already a decimal. It would look like this: 2.33333333333333... If you want a rounded decimal, you can use 2.3. However, 2.3 repeating would be more useful as a fraction for proportions and things. As a fraction, it is 2 1/3 (two and one third).
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If that is 23 repeating then as a fraction it is 23/99
1.916666 repeating
It is 0.304 347 826 086 956 521 739 1 (with the underlined string repeating)
23% = 0.23 as a decimal
23/10 as a decimal is 2.3