Ronen A

I was in the same boat. I'm halfway through AP Calculus BC right now. It's more intuitive now because I worked for the past six months on mastering all the math that came before it -- going back to...

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3. calculus

Good stuff

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3. Multiplication Tricks For 9 Times Tables

yeah my bad - you factor out a two from the top expression and a 4 from the bottom expression.    Then once you do that you simplify the entire fraction

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3. Algebraic expressions: Nested fractions problem

They come from factoring out a two from both numerator and denominator. 

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3. Algebraic expressions: Nested fractions problem