For input boxes containing the maths keyboard, there are some keyboard shortcuts that can be used to make typing in an answer easier. The current symbol shortcuts are:
Multiplication dot: Press the star key "*" to input a multiplication dot.
Fraction: Press the forward slash key "/" to quickly create a fraction.
Subscript: Press the underscore key "_" to begin writing a subscript.
Superscript: Press the upwards arrow "^" to being writing a superscript or power.
Alternatively, you can write the latex code for the particular symbol you want to enter.
This handy Equation Editor should help you get started!