STAAR EOC lessons
Biology & Algebra 1, plus archived Algebra II & Geometry · TEKSForge instruction · Texas public-school and educator videos · TEA released practice where available
Biomolecules
Students connect the monomers and chemical structures of carbohydrates, lipids, proteins, and nucleic acids to their cellular functions, then use those connections to explain real examples.
1 video · worked example · explained practiceCell Complexity
Students compare cell organization across prokaryotes and eukaryotes and evaluate molecular evidence that mitochondria and chloroplasts descended from free-living bacteria.
2 videos · worked example · explained practiceEnzymes
Students model enzyme-substrate interactions and investigate how temperature and pH change reaction rates by altering molecular motion or active-site structure.
1 video · worked example · explained practiceCell Cycle Disruptions
Students trace how checkpoints regulate division and explain how checkpoint failure can allow damaged cells to proliferate, forming tumors and potentially spreading.
1 video · worked example · explained practiceGenetic Crosses
Students move from monohybrid probabilities to dihybrid and non-Mendelian crosses, keeping allele case, inheritance pattern, and the question's reference group explicit.
3 videos · worked example · explained practiceDNA Structure
Students build a nucleotide-level model of DNA, apply complementary base pairing, and explain how nucleotide order stores information that can influence traits.
1 video · worked example · explained practiceProtein Synthesis
Students follow genetic information from a DNA template through transcription and translation, distinguishing the location, molecules, and product of each process.
1 video · worked example · explained practiceMutations
Students compare substitutions, insertions, and deletions at the DNA level and predict downstream effects on codons, amino acids, protein structure, and traits.
1 video · worked example · explained practiceEvolution & Natural Selection
Students explain natural selection as a population-level change across generations, using variation, inheritance, differential survival, and reproduction rather than individual need or choice.
2 videos · worked example · explained practiceAlgebra 1
8 lessonsSolving Linear Equations
Students solve one-variable linear equations by maintaining equivalence, including distribution, combining like terms, and variables on both sides.
1 video · worked example · explained practiceGraphing Linear Functions
Students connect slope-intercept form, tables, and graphs while interpreting slope, intercepts, and zeros in mathematical and real-world contexts.
1 video · worked example · explained practiceGraphing Quadratics
Students use vertex form and symmetry to graph quadratic functions and identify the vertex, axis of symmetry, direction, and zeros.
1 video · worked example · explained practiceSolving Quadratics
Students choose among factoring, square roots, and the quadratic formula, then connect solution methods to the number and nature of real roots.
3 videos · worked example · explained practiceWriting Linear Equations
Students write linear equations from a slope and point or from two points, using substitution to determine the intercept and verifying both given points.
2 videos · worked example · explained practiceSystems of Equations
Students solve two-variable linear systems graphically and algebraically, interpreting the ordered pair as the values that satisfy both equations simultaneously.
2 videos · worked example · explained practiceFactoring Trinomials
Students factor trinomials completely by removing the greatest common factor first and using product-sum relationships, then verify by expansion.
1 video · worked example · explained practiceExponential Functions
Students interpret exponential growth and decay models by identifying the initial value and constant multiplier, contrasting repeated multiplication with linear change.
1 video · worked example · explained practiceExponential and Logarithmic Relationships
Students define a logarithm as an exponent, then use swapped table values and reflected graphs to connect $y=b^x$ with its inverse, $y=\log_b x$.
2 videos · worked example · explained practiceEquivalent Quadratic Forms
Students move between vertex form $y=a(x-h)^2+k$ and standard form $y=ax^2+bx+c$, using expansion and the vertex to decide when two quadratic rules describe the same graph.
2 videos · worked example · explained practiceModeling with Systems
Students translate real-world limits into systems of equations and inequalities, defining variables, reading diagrams carefully, and including the constraints a context implies.
1 video · worked example · explained practiceSolutions from Quadratic Graphs
Students connect the zeros of a quadratic graph to the solution set of $f(x)=0$, explain why a quadratic can have two, one, or no real solutions, and verify graphical answers algebraically.
2 videos · worked example · explained practiceModeling Average Cost
Students build average-cost models by dividing a total-cost rule by the number of items, then interpret how a one-time fee is spread over more items.
2 videos · worked example · explained practiceExponential Growth Models
Students write exponential growth models of the form $f(t)=a(1+r)^t$, converting percent rates to growth factors and matching the time variable to the rate's period.
2 videos · worked example · explained practiceRational Function Graphs
Students solve rational inequalities from graphs and tables by locating zeros and vertical asymptotes, testing each interval, and describing where $f(x)>0$ or $f(x)<0$.
2 videos · worked example · explained practiceSolving Square Root Equations
Students solve square-root equations by isolating the radical, squaring both sides, and checking every result in the original equation to reject extraneous solutions.
2 videos · worked example · explained practiceComposite Transformations
Students describe translated graphs with function notation, tracking a key point to write $h(x)=g(x-c)+d$ and explaining why horizontal shifts appear opposite inside parentheses.
2 videos · worked example · explained practiceTesting Solutions to Systems
Students decide whether proposed solutions satisfy every condition in a system of inequalities, using substitution, graphs, and the practical limits of a context.
2 videos · worked example · explained practiceSolving Rational Equations
Students solve rational equations by noting excluded values, clearing denominators, solving the resulting equation, and verifying the value in the original equation.
1 video · worked example · explained practiceDomain and Range
Students connect domain inputs to range outputs by evaluating rules and reading the horizontal and vertical extent of graphs.
1 video · worked example · explained practiceModeling Data with Functions
Students use differences and nearby scatterplot points to choose reasonable models, extend quadratic patterns, and estimate when a target output occurs.
1 video · worked example · explained practiceTransforming and Solving Equations
Students solve absolute-value equations by isolating the absolute value, writing both linear cases, and checking each proposed solution.
1 video · worked example · explained practiceComplex Solutions
Students simplify nonreal quadratic solutions into $a\pm bi$ form by rewriting negative square roots and dividing every numerator term.
1 video · worked example · explained practiceSolving Systems
Students solve three-variable linear systems by substitution or elimination and test ordered pairs against every inequality in a system.
1 video · worked example · explained practiceParent Functions
Students identify an exponential parent function by removing transformations and checking its intercept, direction, and horizontal asymptote.
1 video · worked example · explained practiceFunctions and Their Inverses
Students find inverses by exchanging inputs and outputs and identify linear functions whose inverses have the same rule.
1 video · worked example · explained practiceConics from a Double Cone
Students classify nondegenerate conic sections by how a slicing plane intersects a double cone, emphasizing the two nappes of a hyperbola.
1 video · worked example · explained practiceConic Parameter Changes
Students use square roots of ellipse denominators to locate intercepts and predict how exchanging parameters changes orientation.
1 video · worked example · explained practiceCompleting the Square
Students complete the square with a nonunit leading coefficient to rewrite a parabola equation and verify that both forms describe the same graph.
1 video · worked example · explained practiceQuadratic Domain and Range
Students distinguish the unrestricted domain of a quadratic rule from a reasonable contextual domain, then use the vertex and direction of opening to determine range.
1 video · worked example · explained practiceRepresentations of Quadratics
Students connect quadratic equations, tables, graphs, and verbal descriptions by identifying the vertex, symmetry, intercepts, and changing rate of growth.
1 video · worked example · explained practiceQuadratics from Roots
Students construct quadratic functions from roots, emphasizing repeated roots and using an additional point when the leading coefficient is unknown.
1 video · worked example · explained practiceFormulating Quadratic Models
Students formulate quadratic equations and inequalities from products, consecutive integers, and changing rectangular dimensions.
1 video · worked example · explained practiceQuadratic Formula and Discriminant
Students rewrite quadratic equations in standard form, interpret the discriminant, and use the quadratic formula to obtain exact solutions.
1 video · worked example · explained practiceSolving Quadratic Equations
Students solve quadratics by factoring and substitution, then use tables and graphs to locate roots that are not listed exactly.
1 video · worked example · explained practiceSquare Root Transformations
Students predict square-root graph transformations by separating input changes from output changes and tracking the endpoint.
1 video · worked example · explained practiceSquare Root Equations
Students solve square-root equations by isolating the radical, squaring both sides, and checking proposed solutions in the original equation.
1 video · worked example · explained practiceSquare Root Inequalities
Students test ordered pairs and tables against square-root inequalities, respecting the radical domain and distinguishing boundary values from the solution region.
1 video · worked example · explained practiceRational Function Asymptotes
Students locate rational-function domain restrictions and vertical asymptotes by factoring, checking cancellation, and distinguishing denominator zeros from numerator zeros.
1 video · worked example · explained practiceExponential Parameter Changes
Students distinguish output multiplication from output addition in exponential rules and use point mappings to classify vertical stretches and shrinks.
1 video · worked example · explained practiceExponential Inequalities
Students solve exponential inequalities with graphs and tables by locating a threshold crossing, checking whether the function increases or decreases, and deciding whether to include the boundary.
1 video · worked example · explained practiceConstructions and Conjectures
Students construct a perpendicular bisector with a compass and straightedge, explain what the equal-radius arcs guarantee, and use the construction to make justified conjectures about triangles and angles.
1 video · worked example · explained practiceAngle, Line, and Circle Conjectures
Students make and test conjectures about parallel and perpendicular lines, central angles and chords, and parallel cross sections of pyramids, separating guaranteed relationships from visual guesses.
2 videos · worked example · explained practiceConverse, Inverse, and Contrapositive
Students write the converse, inverse, and contrapositive of a conditional, identify logically equivalent pairs, and use counterexamples to test statements that do not automatically follow.
1 video · worked example · explained practiceSimilar-Triangle Reasoning
Students draw valid conclusions from angle information, proving triangles similar by AA and distinguishing similarity from congruence.
2 videos · worked example · explained practiceEvaluating Conditional Statements
Students evaluate conditional statements by identifying the hypothesis and conclusion, proving true statements with definitions or theorems, and disproving false statements with a single counterexample.
2 videos · worked example · explained practiceInductive Reasoning
Students extend patterns in tables, make precise conjectures, and test whether an apparent trend continues, using rectangular layouts whose areas can increase and then decrease.
1 video · worked example · explained practiceDeductive Reasoning
Students build deductive arguments by linking conditional statements in the correct direction and distinguishing valid chains from reversed or unsupported conclusions.
1 video · worked example · explained practiceChoosing Representations
Students choose and connect diagrams, verbal descriptions, and algebraic expressions to solve angle problems in isosceles trapezoids, including angles formed by extending the legs.
1 video · worked example · explained practicePatterns to Algebraic Expressions
Students translate growing dot arrangements and shrinking arc measures into nth-term expressions, distinguishing constant differences from constant ratios and checking the starting index.
2 videos · worked example · explained practiceGeneralizing Polygon Patterns
Students generalize polygon exterior-angle patterns by recognizing a constant total turn, explaining why regular polygons have exterior angle 360°/n, and distinguishing inverse variation from constant subtraction.
1 video · worked example · explained practiceTransformations in Real-World Designs
Students rotate asymmetric real-world layouts about a specified center, especially 90° counterclockwise, and check the result using landmarks, distances, and orientation.
1 video · worked example · explained practiceSpecial Right Triangles and Elevation
Students model angles of elevation and depression with right triangles, solve special right triangles from known legs or hypotenuses, and recognize Pythagorean triples in distance and path diagrams.
1 video · worked example · explained practiceCross Sections of Solids
Students describe intersections of planes and solids, emphasizing circular and rectangular sections of cylinders and distinguishing a true slice from a tangent intersection.
1 video · worked example · explained practiceNets of Three-Dimensional Figures
Students connect solids to their nets by matching faces, shared edges, and fold locations, rejecting layouts that overlap or leave an opening.
1 video · worked example · explained practiceOrthographic and Isometric Views
Students build cube structures from front, side, and top views and test isometric drawings against all three projections while keeping the designated front fixed.
1 video · worked example · explained practicePerpendicular Bisectors
Students locate and write perpendicular bisectors on the coordinate plane by combining the midpoint with the perpendicular slope, and verify that points on the bisector are equidistant from the endpoints.
2 videos · worked example · explained practiceSlopes of Parallel and Perpendicular Lines
Students compare slopes to identify parallel and perpendicular lines, write parallel lines with a specified y-intercept and perpendicular lines through a point, and classify quadrilateral sides using slope evidence.
2 videos · worked example · explained practiceDistance, Midpoint, and Slope
Students use midpoint, distance, and slope on the coordinate plane, including finding missing endpoints, locating points on a line with a given slope, and writing distance expressions with variable coordinates.
2 videos · worked example · explained practiceAreas of Polygons and Composite Figures
Students find regular-polygon areas using apothems, decompose composite polygons, and subtract circular regions from squares, including reading lengths from coordinates.
2 videos · worked example · explained practiceArc Length and Sector Area
Students use fractions of a full turn to find arc lengths and sector areas, emphasizing the curved distance traveled by a clock hand's tip.
1 video · worked example · explained practiceThe Pythagorean Theorem
Students identify right triangles in contextual diagrams, solve for a leg or hypotenuse, and combine a calculated segment with another length to answer the actual question.
1 video · worked example · explained practiceSurface Area and Volume
Students calculate surface area and volume of common solids, distinguish lateral from total surface area, and choose the correct radius, perpendicular height, or slant height for each context.
1 video · worked example · explained practiceGeometric Probability
Students find geometric probabilities from area ratios and spinner-sector angles, using relationships among unequal sectors instead of assuming every labeled outcome is equally likely.
1 video · worked example · explained practiceSecants, Chords, and Circle Angles
Students choose circle-angle relationships by locating the angle's vertex, distinguishing central and inscribed angles from angles formed by intersecting chords or exterior secants.
1 video · worked example · explained practiceFaces, Edges, and Vertices of Polyhedra
Students count all faces, edges, and vertices of polyhedra, develop prism-counting patterns, and use Euler's formula to check their results.
1 video · worked example · explained practiceCongruence Transformations
Students identify rigid transformations from coordinate pairs and describe compositions of reflections and translations with a single rule, checking that the rule maps every corresponding vertex.
1 video · worked example · explained practiceTriangle Congruence
Students decide whether triangle information establishes congruence, apply SSS, SAS, ASA, AAS, and HL correctly, and use congruent right triangles to explain altitude and angle-bisector properties in isosceles triangles.
1 video · worked example · explained practiceDilations and Scale Factors
Students investigate dilations, showing that every length is multiplied by the scale factor while angle measures, parallel sides, and the figure's shape are preserved.
1 video · worked example · explained practiceRatios in Similar Figures
Students match corresponding lengths in similar figures and use a consistent scale factor or proportion to find missing dimensions in practical designs.
1 video · worked example · explained practiceTriangle Similarity and Trigonometry
Students use triangle similarity and side-splitter proportions to find lengths, then use sine, cosine, and tangent to express or calculate right-triangle sides from either complementary acute angle.
1 video · worked example · explained practiceScale Factors for Perimeter, Area, and Volume
Students describe how scaling dimensions changes perimeter, area, and volume, using k, k², and k³ for similar figures and multiplying only the factors of dimensions that actually change.
2 videos · worked example · explained practice