Math was hard enough growing up, but this Common Core crap is ridiculous. I use my fingers or a calculator to add up. I don't need to know the deep, hidden meaning of why 5 + 4 = 9, and the complicated method with which Common Core teaches you how to add and subtract. It's ludicrous.
Take a look at the video below. Why complicate matters. You mean to tell me someone is going to go through that whole long-winded process to figure out what 9 + 6 is?
What the heck?
Most people use calculators as adults. Who cares why 9 + 6 = 15 using the base 10, and a piece of paper.
And here's how to subtract.