how do you input fractions

The is a square root button on the calc or you could just input 

sqrt(6)

Fractions are shown like this    \       . For example 1/2   .   

Square root is the opposite of squaring, it is finding the number that is doubled to find your number.

E.g. 16 ...

4*4=16

$${\sqrt{{\mathtt{16}}}} = {\mathtt{4}}$$

To put this into Algebra, if N was your number and A was square root of it .

$$\\\\\sqrt{{\textcolor[rgb]{0,0,1}{N}}}=\textcolor[rgb]{0,0,1}{A}^2\\\\ \\\textcolor[rgb]{0,0,1}{A}\times\textcolor[rgb]{0,0,1}{A}= \textcolor[rgb]{0,0,1}{N}\\ \\\textcolor[rgb]{0,0,1}{A}^2=\textcolor[rgb]{0,0,1}{N}\\$$