This is my entry into the burning question, round 6.5.
I think that addition falls into the category of "Things that you should have learned in school, had you been paying attention", but for whatever reason, you are here.

Step 1: The basics

One of the most basic properties of addition is that it is commutative. AKA it doesn't matter what order you add the numbers in, so long as addition and/or subtraction is all that you're doing.
that is to say that 50+25=75, and 25+50=75

And perhaps more importantly, addition is associative, meaning that you can add more than two numbers together and get the same result.
Which is to say that 25+25+25=75, and 15+15+15+15+15=75

But how does it happen? How do you add? I will try and explain it in the next few steps

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