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SAT Math — Công Thức Cốt Lõi
Mọi công thức và mẫu cho phần Math của Digital SAT trên một trang.
Digital SAT Math: Format, Adaptive Sections, and Pacing
How the Digital SAT Math section is structured — two adaptive modules, 44 questions in 70 minutes, calculator throughout, embedded Desmos. The format strategy that protects your score before you solve a single problem.
SAT Algebra: Linear Equations and Inequalities
Linear equations and inequalities are the highest-frequency topic on Digital SAT Math (roughly 7–9 questions per test). Four solve patterns, one Desmos shortcut, and the inequality-flip trap that costs students the most points.
SAT Algebra: Systems of Linear Equations
Substitution, elimination, and the Desmos intersection trick — every method for solving SAT systems of equations, plus how to recognize "no solution" and "infinite solutions" word-problem traps.
SAT Advanced Math: Quadratic Functions and the Parabola
Three forms of the quadratic, the discriminant rule, when to factor vs. use the formula, and the Vieta shortcut that solves "sum of the roots" questions in under 10 seconds.
SAT Advanced Math: Exponentials and Nonlinear Functions
Exponent rules, the growth/decay master template y = a·b^x, and how to translate "increases by 5% per year" into a math model. Plus the extraneous-solution trap on radical equations.
SAT Problem-Solving: Ratios, Rates, and Percentages
The three question types for percentages, the part-to-whole ratio trap, and the multiplier stacking trick that turns "20% off then 15% off" into one fast multiplication.
SAT Problem-Solving: Statistics and Data Analysis
Mean vs. median (and the outlier effect), standard-deviation comparisons, scatterplots, two-way tables, and the correlation-vs-causation trap the SAT loves to set.
SAT Geometry: Lines, Angles, and Triangles
Angle relationships, Pythagorean triples worth memorizing, special right triangles (45-45-90 and 30-60-90), and the similar-triangle setup that solves most SAT geometry word problems.
SAT Geometry: Circles and Coordinate Geometry
The standard-form circle equation, completing the square to find a center, arc length and sector area, the distance and midpoint formulas, and the degrees-to-radians conversions you must memorize.
SAT Trigonometry: SOHCAHTOA and the Unit Circle
SOHCAHTOA right-triangle definitions, special angle values for 30°/45°/60°, the cofunction identity (sin θ = cos(90°−θ)), the Pythagorean identity, and the unit-circle sign pattern (ASTC).