Level 4 Algebra Learning Objects

Filling Glasses.
Filling Glasses presents graphs representing liquid filling glasses of different shapes (more info).
Filling glasses: find the right glass
Filling glasses: find the right graph
Filling glasses: create the right glass
Filling glasses: create the right graph
Filling glasses: graphing and comparing icon.
Learn Alberta.
Learn Alberta: Exploring Algebra series (more info).
Exploring algebra
National Library of Virtual Manipulatives.
NLVM: Algebra manipulatives
Algebra balance scales
Algebra balance scales: negatives
Coin problem