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ACCUPLACER Math: Knowledge Library & Illustrated Guides

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A count of 200 rises to 250 by 25 percent, while a count of 250 falls to 200 by 20 percent. Both arrows describe a change of 50 in opposite directions. ORIGINAL GUIDE
OpenExam original · 12 min read

Compare rates and percent changes

Pick a denominator that matches what you want to compare.

Read the illustrated guide
Three routes for solving quadratics. An isolated square suggests square roots, a product equal to zero suggests setting factors to zero, and a general expanded form can use the quadratic formula. ORIGINAL GUIDE
OpenExam original · 12 min read

Choose a quadratic method

Read the equation’s form before choosing a way to solve it.

Read the illustrated guide

Original guides explain selected concepts using retained source references, new examples and original diagrams. They are teaching resources, not video transcripts or official exam papers.