Here is a great k-1 math concentration game: Play in Guided Math Groups and Math Centers
Here is a great game for kindergarten and first grade students. I would play this in a guided math group where I watched the students and then asked them to explain to me how they found the answers. I would also set this up as a center concentration and/or match game and have the students play it with a partner. Be sure to put out scaffolds for reference, such as numberlines and number grids. You could also use this game as an assessment during a student interview.