How To Add and Subtract Binary Numbers | Computer Science 

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5:10 How to check your binary addition (by converting to decimal) 6:15 2 Key points about binary addition 6:52 Binary addition - worked example 7:50 What to do with 3 1s in a single column 8:32 Confirming binary addition worked example with decimal conversion 10:25 Binary subtraction 10:48 What to do with 0 - 1 (borrowing) 11:35 Worked example: 1 0 0 - 1 0 12:00 Worked example: 1 0 0 - 1

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10:19 substraction starts

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In terms of subtraction as the first subtraction example given. I see a tricky part that also not mentioned in detail however I tend to assume the author teach us with all love spared. What is missing in this example, it's not mentioned that we use 10-base as by pass (workaround) which after conversion to 10 base made gives us 2-1 respectively (as a result we get) = 1, which re-converted to 2 base is 01 or just 1. I mean as mentioned in the previous comment this guy does his best teaching us and I am appreciated for all his time spared, but you cannot learn science without questioning people you been surrounded by. It means that always ask even if looks nice to you. It means that no one is perfect besides the fact they can explain it pretty well. TL;DR for subtraction : always have online converter otherwise binary cheat sheet (conversion table) at hand (or learnt by heart, what a burden!) convert each row in the stack of subtraction process to 10-base, do the arithmetics, re-convert to 2-base for output as final 2-base solution. This way of thinking works best for me. Cheers.

OMG thank you, your explanation of borrowing in binary subtraction is the only one I've found that makes any sense to me.

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I am a bit confused in the subtraction. We borrow 1 from the left and the 0 becomes 2? Shouldn't it become 1?

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