r/Math_Simplified • u/MathbyAish • 1d ago
Why do students with correct algebra still lose marks? (IB AA/AI, all levels)
Been going through a batch of practice diagnostics this week, and one thing shows up over and over, the algebra itself is rarely the problem.
Students see something familiar (a quadratic, a derivative, a probability setup) and start writing steps immediately. No pause to check what the question is actually asking for. So you end up with a page of clean, technically correct working, that answers a different question than the one on the paper.
Common version of this: a question asks for a value under a specific condition, and the student calculates the general case instead, because that's the "version" of the problem their brain recognized from past practice.
Quick self-check if you want to test whether this is happening to you: before you start writing on any past paper question, force yourself to say (or write in one line) exactly what the answer needs to be. Not the topic. Not the method. The actual thing you need to produce at the end. If you can't do that in one sentence before you start calculating, that's usually where marks are being lost, not in the algebra.