Middle & high school · Starter lessons
Find a focused lesson for tutoring, homeschool or the classroom. Explore a worked example, try the practice, and choose a video that fits your learners.
Ask a question.
Show your reasoning.
Choose your next step
Mathematics
Use direction and distance to explain integer addition and subtraction.
▷ 2 video choices · Practice & answers
Open lesson →: Signed Numbers on a Number LineMathematics
Use equivalent ratios and unit rates to compare quantities with units.
▷ 2 video choices · Practice & answers
Open lesson →: Ratios and Unit RatesMathematics
Use inverse operations on both sides to solve a one-variable equation.
▷ 2 video choices · Practice & answers
Open lesson →: Solve and Check an EquationEnglish language arts
State a central idea and explain how specific details support it.
▷ 2 video choices · Practice & answers
Open lesson →: Central Idea and Supporting EvidenceEnglish language arts
Connect a clear claim to relevant evidence with explicit reasoning.
▷ 2 video choices · Practice & answers
Open lesson →: Build an Evidence-Based ParagraphEnglish language arts
Improve a paragraph by clarifying references, choosing precise language and removing repetition.
▷ 2 video choices · Practice & answers
Open lesson →: Revise Sentences for ClarityScience
Identify a question, variables and measurements for a controlled comparison.
▷ 2 video choices · Practice & answers
Open lesson →: Plan a Fair InvestigationScience
Use particle models and evidence to distinguish types of material change.
▷ 2 video choices · Practice & answers
Open lesson →: Particles, Physical Changes and Chemical ChangesScience
Use arrows to explain energy transfer and predict possible effects in a food web.
▷ 2 video choices · Practice & answers
Open lesson →: Trace Energy in a Food WebSocial studies
Distinguish source types and evaluate what a source can and cannot show.
▷ 2 video choices · Practice & answers
Open lesson →: Ask Questions of Historical SourcesSocial studies
Explain how location and resources can influence settlement without assuming they determine every outcome.
▷ 2 video choices · Practice & answers
Open lesson →: Geography, Resources and SettlementSocial studies
Compare civic proposals using goals, evidence, costs and affected groups.
▷ 2 video choices · Practice & answers
Open lesson →: Compare Solutions to a Community ProblemMathematics
Interpret slope and intercept and evaluate whether a linear model fits a context.
▷ 2 video choices · Practice & answers
Open lesson →: Interpret a Linear ModelMathematics
Factor a simple quadratic and use the zero-product property to find solutions.
▷ 2 video choices · Practice & answers
Open lesson →: Solve a Quadratic by FactoringMathematics
Apply a² + b² = c² to a right triangle and interpret the result with units.
▷ 2 video choices · Practice & answers
Open lesson →: Right Triangles and the Pythagorean TheoremEnglish language arts
Evaluate whether an argument’s evidence supports the scope of its claim.
▷ 2 video choices · Practice & answers
Open lesson →: Evaluate Claims and EvidenceEnglish language arts
Build an interpretation from patterns in an original passage and consider an alternative reading.
▷ 2 video choices · Practice & answers
Open lesson →: Support a Literary InterpretationEnglish language arts
Revise thesis, paragraph order and transitions so an essay develops a coherent argument.
▷ 2 video choices · Practice & answers
Open lesson →: Revise an Essay’s StructureScience
Use a model to explain diffusion and distinguish passive from active transport.
▷ 2 video choices · Practice & answers
Open lesson →: Cell Membranes and DiffusionScience
Use a Punnett square to describe probabilities and explain the model’s limits.
▷ 2 video choices · Practice & answers
Open lesson →: Use a Simple Inheritance ModelScience
Describe patterns in ecological data and distinguish observations from causal explanations.
▷ 2 video choices · Practice & answers
Open lesson →: Interpret Ecosystem DataSocial studies
Distinguish federal, state and local responsibilities while recognizing overlap.
▷ 2 video choices · Practice & answers
Open lesson →: Federalism and Levels of GovernmentSocial studies
Compare accounts and explain why agreement is useful but not sufficient for establishing a claim.
▷ 2 video choices · Practice & answers
Open lesson →: Corroborate Historical AccountsSocial studies
Identify the next-best alternative forgone and explain how priorities shape a decision.
▷ 2 video choices · Practice & answers
Open lesson →: Opportunity Cost and Public Choices