Hard to know how much detail to go into on 2' s complement.

In connection with the claim that it makes computer arithmetic easy to implement , we could draw this out a bit by talking about the fact that you don't need a different unit to do subtraction (just negate and add), and do some examples (like 33 plus -33) to show that the overflow can be ignored.

But then you are tempted to start talking about checking for overflow, etc., etc
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