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Here, we list without proof some of the most important rules of matrix algebra - theorems that govern the way that matrices are added, multiplied, and otherwise manipulated. Notation. A, B, and C are matrices. A' is the transpose of matrix A. A-1 is the inverse of matrix A. The Math Formulas You Should Memorize For The SAT. I frequently get asked about the key math formulas that students really need to know for the SAT. After 15 years of tutoring SAT math, I have created a small list of the most important formulas that students should memorize. Everything you need to know on this subject is below.