The numbers that can be expressed in fractional form \(\dfrac{a}{b}\) where \(a\) and \(b\) are integers and \(b \ne 0\).
The numbers that cannot be expressed in fractional form.
\(\sqrt{a}\times \sqrt{b}=\sqrt{a\times b}\)
\(\dfrac{\sqrt{a}}{\sqrt{b}}=\sqrt{\dfrac{a}{b}}\)
\(k\times \sqrt{a}=\sqrt{k^2\times a}\) (for \(k\) is a rational number)
\((\sqrt{a})^2=a\)
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