Games
Since we have Chromebooks in every student's hands now I also think it is important to learn how to type correctly. The following website is great for learning home row. Students can sign up by using their Google Account:
http://www.kellers.typingclub.com
Here you will find games to practice your basic math facts: addition, subtraction, multiplication, division, etc.
Here you will find a collection of "engaging" games created by teachers and educators to work on specific skills that are challenging and age appropriate. The games can "tickle your brain" and it will track your progress by logging in for free.
Here is a website designed by an elementary teacher with the goal of reinforcing fundamental learning in math, reading, spelling, language arts, and basic problem solving. It is free and DOES NOT require a log in.
Here are some games to help with multiplication facts:
http://www.multiplication.com/games/all-games
Here is a website that has math problems of varying difficulties that can be completed for fun!