Khan Academy: Pre-Calculus
Khan Academy

The Precalculus course, often taught in the 12th grade, covers Polynomials; Complex Numbers; Composite Functions; Trigonometric Functions; Vectors; Series, Conic Sections, Probability and Combinatorics.

Khan Academy: Linear Algebra
Khan Academy

Learn linear algebra for free—vectors, matrices, transformations, and more.

Illuminations: Sums of Vectors and Their Properties
Illuminations (National Council of Teachers of Mathematics)

This example illustrates how using a dynamic geometrical representation can help students develop an understanding of vectors and their properties, as described in the Number and Operations Standard.

Illuminations: Components of a Vector
Illuminations (National Council of Teachers of Mathematics)

In this lesson, students manipulate a velocity vector to control the movement of a car in a game setting.

NRICH: Vector Racer
NRICH (University of Cambridge)

Who can get round in the fewest moves?

GeoGebra: Mystery Scalar and Vectors Investigation
GeoGebra

Two vectors and a mystery scalar: Discovery Learning Investigation