Texas Education Agency
Texas Gateway: Ap Physics: 2.2 Vectors, Scalars, and Coordinate Systems
By the end of this section, you will be able to do the following: Define and distinguish between scalar and vector quantities and Assign a coordinate system for a scenario involving one-dimensional motion.
Wolfram Research
Wolfram Math World: Scalar Multiplication
Describes how a scalar can be multiplied to a vector and shows this using diagrams. Site also contains related links, graphs, and pictures.
Larson Texts
Larson Precalculus: Magnitude of a Scalar Multiple [Pdf]
Example and some exercises on how to find the magnitude of a scalar multiple.