Digital Learning Objects

Biscuit Factory explores ratio relationships in the context of gears.
Biscuit factory: ratios
Biscuit factory: complex ratios
Biscuit factory: directions
Biscuit factory: create a two-gear system
Biscuit factory: create a three-gear system
Biscuit factory: gears and speed

Drive helps users solve proportional problems with distance and time.
Drive: hard problems

Squirt helps users explore and express proportional relationships.
Squirt: three containers: complex proportional relationships

Bases helps users explore numbers in different bases using a place value model.
Bases