The Combo Kit is the core of the Mortensen manipulatives and is used across all strands and levels.
The top tray contains,
- nine of each unit bar 1-9
- ten 10’s
- one 100
- skip count underlays for each of the unit bars 1-9
The bottom tray contains,
- twenty-one unit cubes
- three of each unit bars 2-5
- thirty 10’s (three are red)
- nine 100’s
The units and 10’s are segmented on one side and hollow on the back. The segmented side represents positive numbers and the hollow side represents negative numbers.
The side of the 10’s are smooth and represent unknown numbers such as x.
The back of the 100’s are smooth and represent unknown squares such as x2.