Subtraction using two's compliment

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You need to know two's compliment in order to do this. Take a look at my other two's compliment tutorial.


Subtracting a number using two's compliment is easy as pie. Or pizza. Maybe cake.

In standard denary maths, adding a negative number is the same as subtracting a positive version of the same number.


1 + -2 == 1 - 2

The same applies to binary maths.
If we want to subtract one binary number from another, we can add an inverted


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