Desmos walkthroughs for SAT math practice
Original SAT-style practice questions, each worked step by step in Desmos — the same graphing calculator that's built into Bluebook — with the algebra method alongside and the common trap called out. Pick a topic you want to practise.
QuadraticsSum of a quadratic’s solutions →Find both zeros on the graph and add them, or use the −b/a shortcut if you remember it.
Linear equationsSystems of linear equations →Type both equations as written, tap where the lines cross, then answer what the question actually asks.
QuadraticsVertex and maximum value →Graph a height model, tap the turning point, and pick the coordinate the question wants.
QuadraticsQuadratic roots (x-intercepts) →Tap where the parabola crosses the x-axis to get both roots, with no factoring or formula needed.
GeometryCentre and radius of a circle →Type an expanded circle equation as given and read the centre and radius off the grid, with completing the square alongside.
Exponential functionsExponential growth →Graph the growth model against a target value and tap the crossing, with logarithms only if you want them.
Data analysisLine of best fit →Put the data in a table, run y₁ ~ ax₁ + b, read the slope and intercept, then make a prediction.
Polynomial equationsSolving for x by graphing both sides →Graph each side of an equation as its own y =, tap the crossings, and pick the solution the question asks for.
Linear inequalitiesSystems of linear inequalities →Shade both inequalities, find where they overlap, and tell dashed boundaries (left out) from solid ones (included).
Absolute valueAbsolute value equations →Type abs for the bars, graph both sides, and tap every crossing so neither case gets dropped.
New to graphing in Desmos? Start with the Desmos cheat sheet, or see how the topics fit into a few weeks of study in the December SAT study plan.
Stuck on a different practice question?
Snap a photo of any SAT-style math practice question and CalcHack walks you through the fastest route, in Desmos or by hand. Five free scans every day, no account needed to start.
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