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Can all numbers be written as fractions? Don't be irrational - understand some of the fundamental classifications of numbers.

What is \(0.1212 \ldots\) in fractional form?

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\[ \frac{n}{ 810} = 0.\overline{d25} = 0.d25d25d25d25\ldots \]

For which positive integer \(n\), will \(d\) be a digit?

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\[\large \displaystyle {0. \overline{42}-0.\overline{35}= \ ?}\]

**Note:** \(0.\overline{ab}=0.abababab \ldots \)

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Is \(0.285714285714\overline {285714...}\) rational?

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