SmartyGames is a site with a variety of interactive games for elementary students. Choose from math, money, time, counting, and reading for students to practice skills. There are also some games just for fun. Many of these activities will work well on a SMARTboard but some require keyboards.
I generally don't post links to full sites as they are usually filled with ads. But I am posting to SmartyGames because it is AD FREE and will keep your students engaged.