Math in ASM

Here's my problem: Int 12h returns the base memory size into AX. It's always gonna be 640Kb on modern computers, but AX stores 280h. I want to print 640 to the screen, so I would have to convert 280h to decimal, get 640 then convert that to ASCII to print with int 10h?? Can anyone show me how I can do this with ASM code?

Thanks,
Navic


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