58 Why is it possible to teach real numbers before even rigorously defining them? 27 How to respond to “solve this equation” in a basic algebra class 20 Given a 3 4 5 triangle, how do you know that it is a right triangle? 18 How to explain that the sums of numerators over sums of denominators isn't the same as the mean of ratios? 18 Is there a more telling name for "Calculus 2"?

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 +10 Why are induction proofs so challenging for students? +20 What is the rationale for distinguishing between proper and improper fractions? +90 I want a "true" proof by contradiction of an implication P => Q +10 implicit differentiation, formula of a tangent line

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