Most of the basic formulas aren’t really complex and built step by step. Volume of a cube is side^(3), that’s simple. Mass is density*volume, so mass of a cube would be side^(3)*density. A momentum of a moving thing is mass*speed, so a momentum of a thrown cube would be side^(3)*density*speed. And so on.
The thought process for most things isn’t really that complex: thing A depends on things B, C and D, A gets four times bigger if you double B, two times bigger if you double C and two times smaller if you double D, so it’s highly likely that A = B^(2)*C/D.
More complex things appear when you apply mathematical operations like integration but that’s still applying a well-defined operation to a simplier formula. Every part has a meaning and they combine into one large equation.
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