Math lesson videos
168 short animated lessons — one for every skill we teach, from counting to calculus. Each one shows the idea with a picture first, then names the rule.
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Kindergarten & Grade 1
- Counting on — what comes nextKindergarten
- Missing number in a sequenceKindergarten
- Numbers before — to 100Kindergarten
- Which is greater?Kindergarten
- Which is less?Kindergarten
- ×2, ×5, ×10 (skip counting)Grade 1-2
- Adding by counting on (+1, +2, +3)Grade 1
- Adding zero & turnaroundsGrade 1
- Doubles (1+1 … 9+9)Grade 1
- Find the difference (count up)Grade 1-2
- Near-doubles (use the double you know)Grade 1-2
- Numbers after — to 100Grade 1
- Place value — onesGrade 1
- Place value — tensGrade 1
- Skip counting by 10Grade 1-2
- Skip counting by 2Grade 1
- Subtract 0 and subtract allGrade 1
- Subtracting by counting back (−1, −2, −3)Grade 1
Grades 2–3
- 2-digit addition (no regrouping)Grade 2-3
- 2-digit subtraction (no borrowing)Grade 2-3
- Bridging down through 10Grade 2
- Compare two-digit numbersGrade 2
- Fact families to 18Grade 2
- Halving & near-halves (using doubles)Grade 2
- Identifying fractionsGrade 2-3
- Make ten & bridging through 10Grade 2
- ÷1 and dividing a number by itselfGrade 3
- ÷2, ÷5, ÷10Grade 3
- ÷3 and ÷4Grade 3-4
- ×1 and ×0Grade 3
- ×3 and ×4 (build from ×2)Grade 3-4
- 2-digit addition (regrouping)Grade 3
- 2-digit subtraction (borrowing)Grade 3
- 3-digit addition & three addendsGrade 3-4
- 3-digit subtraction (regrouping)Grade 3-4
- Comparing fractionsGrade 3
- Square facts (n × n)Grade 3
- Square-root facts (n² ÷ n)Grade 3
Grades 4–5
- ÷10, ÷11, ÷12Grade 4
- ÷6, ÷7, ÷8, ÷9Grade 4
- ×10, ×11, ×12Grade 4
- ×6, ×7, ×8, ×9 (the hard facts)Grade 4
- 2-digit × 1-digitGrade 4-5
- Break apart to multiply (no carrying)Grade 4
- Carrying in multiplicationGrade 4-5
- Decimal operationsGrade 4
- Decimals — subtractGrade 4-5
- Division with remaindersGrade 4-5
- Fact families & missing dividendGrade 4
- Fact families & missing factorGrade 4
- Multiplying tens (20 × 3)Grade 4
- Order fractionsGrade 4
- Simplifying fractionsGrade 4
- 2-digit & 3-digit ÷ 1-digitGrade 5
- 2-digit × 2-digitGrade 5
- Add & subtract decimalsGrade 5
- Adding fractionsGrade 5
- Compare decimalsGrade 5
- Decimal place valueGrade 5
- Decimals — multiply by a whole numberGrade 5
- Improper fractionsGrade 5
- Mixed numbersGrade 5
- Multiply fractionsGrade 5-6
- Round decimalsGrade 5
- Subtract fractionsGrade 5
Grades 6–8
- Decimals — divide by a whole numberGrade 6
- Divide decimalsGrade 6
- Divide fractionsGrade 6
- Expressions · Evaluate (+/−)Grade 6
- Expressions · Evaluate (×)Grade 6
- Expressions · Order integersGrade 6
- Multiply decimalsGrade 6
- Percent of a numberGrade 6-7
- PercentagesGrade 6
- ProportionsGrade 6-7
- RatiosGrade 6
- Simplify · Combine like termsGrade 6-7
- Equations · Integer add & subtractGrade 7
- Equations · One-step (×)Grade 7
- Graphing linesGrade 7
- InequalitiesGrade 7-8
- Percent increase & decreaseGrade 7
- Simplify · Distributive propertyGrade 7
- Simplify · Order of operationsGrade 7
- Slope and interceptGrade 7-8
- Solving one-step equationsGrade 7
- Solving two-step equationsGrade 7
- Two-step equations (-)Grade 7-8
- Adding polynomialsGrade 8
- Classify polynomials by termsGrade 8
- Equations with a fractionGrade 8
- Equations with distributionGrade 8
- Evaluate f(x) = mx + bGrade 8-9
- Evaluate polynomialsGrade 8
- Multiply monomialsGrade 8-9
- Subtract polynomialsGrade 8
- Transformations on the planeGrade 8
- Variables on both sidesGrade 8
- Write in standard formGrade 8
High school
- Difference of squaresGrade 9
- Distribute a monomialGrade 9
- Divide by a monomialGrade 9
- Exponential functionsGrade 9-10
- Factor out the GCFGrade 9
- Factor trinomials (a ≠ 1)Grade 9-10
- FactoringGrade 9
- Graphing parabolasGrade 9
- Larger, estimate & simplify rootsGrade 9-10
- Multiplying polynomialsGrade 9
- Perfect squares & square rootsGrade 9
- Perfect-square trinomialsGrade 9-10
- Polynomial long divisionGrade 9-10
- Pythagorean theoremGrade 9
- Solve by factoringGrade 9-10
- Solve x² = k (perfect squares)Grade 9
- Zero-product propertyGrade 9
- Composition of functionsGrade 10
- Discriminant & # of solutionsGrade 10
- Domain of a rational functionGrade 10
- End behaviorGrade 10
- Factor by groupingGrade 10
- Inverse functionsGrade 10-11
- LogarithmsGrade 10-11
- Multiplicity — cross or bounceGrade 10-11
- Quadratic equationsGrade 10
- Range of a quadraticGrade 10
- Right-triangle ratiosGrade 10
- Sequences and seriesGrade 10-11
- Sum & difference of cubesGrade 10
- Turning pointsGrade 10-11
- y-intercept of a polynomialGrade 10
- Complex numbersGrade 11-12
- Degrees to radiansGrade 11
- Fundamental Theorem of AlgebraGrade 11
- Geometric sequencesGrade 11
- Powers of iGrade 11
- Pythagorean identityGrade 11-12
- Rational Root TheoremGrade 11
- Solve exponential equationsGrade 11
- Synthetic divisionGrade 11
- Unit-circle valuesGrade 11
- ApplicationsGrade 12
- DerivativesGrade 12
- Differentiate monomialsGrade 12
- IntegralsGrade 12
- Integrate powersGrade 12
- LimitsGrade 12
- Limits of polynomialsGrade 12
- Power ruleGrade 12
- VectorsGrade 12
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