my calculator lets me hex numbers but this one would not

how do i hex a number?

Hex numbers are: $\begin{array}{lrrrrrrrrrrrrrrr} \text{Hex-Numbers} & 0 & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 & A & B & C & D & E & F\\ &0 & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 & 10 & 11 & 12 & 13 & 14 & 15 \end{array}$

Example:

$\begin{array}{rrrrr} 1234_{10} &=& 4D2_{16} \\ \\ \hline \\ && q & r & r_{\text{hex}}\\ \\ \hline 1234 & : 16 & 2 & 2 & 2\\ 77 & : 16 & 4 & (13) & D\\ 4 & : 16 & 0 & 4 & 4\\ \end{array}$

give us the number!!!!.