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Math. I can do math like that.
My invoice sheet for my job, I do the math in my head before I double check with a calculator.
In school, I just learned to do it the long way because the school system focuses more on the systems and conformity than making sure kids learn.

As a kid I got frustrated with long division. I saw it as a tool to learn division, rather than division for the sake of division. I learned short division and saw the long division as messy, unnecessary math. I wanted to ‘win’ at learning, and didn’t see the teacher’s perspective – not unnecessary, instead making and reinforcing learning. Haven’t used my math skills for anything but addition and subtraction with simple division for years, for the most part – all an adult needs to know is how much money you have, when you get more and how to make it last over time. I’m pretty good at that as I played business sims as a nipper, I also sometimes play factorio style and god games. I don’t like time limits or make-work, but constraints in the metagame I actually enjoy overcoming.

Long division has its place.

I have concluded that common core math is throwing an entire box of crutches at a child when they jus need to be shown the long way (to understand what is really happening) and taught the practical way. Crutches can be pulled out as needed.

Yes, a pop quiz that emphasizes the process over the results always sucks.

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