Answer
$BCF_{sixteen}$
Work Step by Step
In base 16,
A=10, B=11, C=12, D=13, E=14, F=15
(base ten amounts)
Rightmost column: $(B+4)_{sixteen}=(11+4)_{ten}=F_{sixteen}$
record F, no carry
$\left[\begin{array}{llll}
& 5 & 3 & B_{sixteen}\\
+ & 6 & 9 & 4_{sixteen}\\
- & - & - & -\\
& & & F_{sixteen}
\end{array}\right]$
Next column: $(3+9)_{sixteen}=12_{ten}=C_{sixteen}$
record C, no carry
$\left[\begin{array}{llll}
& 5 & 3 & B_{sixteen}\\
+ & 6 & 9 & 4_{sixteen}\\
- & - & - & -\\
& & C & F_{sixteen}
\end{array}\right]$
Next column: $(5+6)_{sixteen}=11_{ten}=$
record $B$,
Result: $BCF_{sixteen}$
