#23
but calcs don't make coffee

#24
I don't need coffee, but to correct my statement: "Calculators are good at this game, because they help me to convert hexadecimal numbers into decimal numbers"

#25
just multiply the first digit with 16 and add the latter

#26
And if they have got more than two digits?

#27
knew that once but forget about it. too lazy or tired to think about it right now. But #100 equals 256.

#28
and 256 is 16² (16^2 or 16*16)

#29
ok, then its clear, isn't it?

#30
I think you have to do this:
<digit>*16^<count digits from right where the first is the 0th>+and so on
so #30 is 3*16^1 so 3*16 so 48 (right BTW )

fine
#31

#32

#33

#34

#35

#36

#37