Ok, I know I'm still new with assembly, but I can not find an operand for division even though I've searched in the assembly help contents and online
btw I've looked at some other posts which has something like
mov and div
but I don't think they work
maybe my assembly is different to others?
just in case there is other assembly language, mine uses languages like LDAA #$10 etc
So if anyone knows the answer, please help me

It does not appear that you are programming an x86, rather something smaller which probably does not implement division (or multiplication for that matter).

You can always create an integer division using test, subtract and shift. It's messy htough.