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What is the simplest way to write 0.4 repeating as a fraction

What is the simplest way to write 0.4 repeating as a fraction
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What is the simplest way to write 0.4 repeating as a fraction

User Liem
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x=0.\overline{4}\\ 10x=4.\overline{4}\\ 10x-x=4.\overline{4}-0.\overline{4}\\ 9x=4\\ x=(4)/(9)
User Leijonien
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