PBS Kids Lab is a great site for educators looking for educational resources and online games for Math. These games focus on PBS's famous cartoon characters such as: Curious George, Dinosaur Train, Wild Kratts, etc etc. These games focus on kids ages 3-8 yrs old. PBS Kids Lab also has a nice variety of home activities as well as other classroom activities, such as Augmented Reality.
I highly recommend checking out PBS Kids Lab by clicking here!!