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If you can write down the number completely, using digits, decimals, and fractions, then it's rational.
0.8 = 8 × 0.1 = 8 × 1/10
Restate the question: If you can write a fraction as a decimal, can you write a decimal as a fraction?Yes.
In much the same way as anyone writes decimals.
If you can completely write a number, using digits, fractions and decimals, then the number is rational. You appear to have accomplished that.