Follow your curiosity.
180 hands-on lessons, nine subjects, and plenty of places to begin.
Lines & slope
See how slope and intercept determine a line.
FoundationExplore →The shape of a quadratic
Move a parabola and locate its vertex and roots.
FoundationExplore →Transforming functions
Translate, stretch, and reflect a parent function.
FoundationExplore →Exponential growth
Compare multiplicative change with additive change.
FoundationExplore →Logarithms as inverses
Reflect an exponential curve across the line y = x.
FoundationExplore →Systems of equations
Find the point where two constraints agree.
FoundationExplore →
↗Linear inequalities
Understand the regions that make a statement true.
FoundationExplore →
↗Absolute value
Measure distance from zero and solve distance constraints.
FoundationExplore →
↗Polynomial behavior
Connect factors, roots, and end behavior.
FoundationExplore →
↗Rational functions
Explore zeros, holes, and vertical asymptotes.
FoundationExplore →
↗Domain & range
Distinguish allowed inputs from possible outputs.
FoundationExplore →
↗Inverse functions
Reverse an input-output relationship.
FoundationExplore →Factoring expressions
Read multiplication backwards using area.
FoundationExplore →
↗Completing the square
Turn a quadratic into a shifted square.
FoundationExplore →
↗Exponent rules
Explain multiplication and division of powers.
FoundationExplore →
↗Roots & radicals
Connect roots, powers, and real domains.
FoundationExplore →
↗Function notation
Follow an input through a mathematical machine.
FoundationExplore →
↗Piecewise definitions
Build one function from several rules.
FoundationExplore →
↗Average rate of change
Measure change across a whole interval.
FoundationExplore →
↗Building algebraic models
Translate a real constraint into an equation.
FoundationExplore →Why a² + b² = c²
Rearrange four triangles to reveal a timeless proof.
FoundationExplore →The area of a triangle
Change the height while keeping a base fixed.
FoundationExplore →Where πr² comes from
Rearrange sectors to see a circle become an almost rectangle.
FoundationExplore →Similar triangles
Scale lengths and watch how area responds.
FoundationExplore →