I have an HW question where I found an answer that matches mine, but their breakdown confuses me.
Ques: What is 4365 - 3412 when these values represent unsigned 12-bit octal numbers? The result should be written in octal. I used binary and then looked up the Octal to obtain 753
Found solution: 4365-3412 = 0753 This is because 5-2 = 3 (makes sense), 6-1 = 5 (yep), 8+3-4=7 #we need a carry here, since 3<4 and 4-4=0
I can see where they got 8 (I think) 3+5=8, but why did they do that and how are we getting a carry for the ending of 4-4=0. Appreciate any help/reference.