Math Games for a 1st Grader

I’m eager to make sure that Henry (1st grade) builds a really strong foundation for math fluency while he’s young. I feel like I memorized math rather than build a really deep, conceptual understanding of it. The Montessori math he does at school is WONDERFUL, but I also want to support him at home. 

I saw this game pack featured on Kickstarter and went ahead and purchased it. It finally arrived! So far, we are having fun playing the math games. They mainly build number sense and fluency.