Sweet Sounds of Kindergarten : Math- Addition Cups! Cups have holes in them so that the manipulative a drop through. The kids use white board markers to write the numbers.
Lego math games for kids - gotta get some Legos. More than and less than does not compute when kiddos can count objects but do not have number sense yet. Taller and shorter are much easier concepts.
Building Shapes with Craft Sticks is kinda the only one Owen would be interested in at his age but these are cool!