Here's a new page, just for you! 
Math Flashcards Online - This site is all about flashcards. It is a quick resource that allows the teacher to choose what type of flashcard they want to practice with their students. They have the choice between addition, subtraction, multiplication, and division. There is a timer with each question and give the student choices to choose from. Very simple website, but great for practice.
Math Playground - Math playground allows teachers to choose a grade level for their students. There are different math games that practice many Math skills. Students will have the chance to choose the game they want to play. They won't even know they are learning because they are playing a game. This site even has games that students can play together.
Hooda Math -This math site is a little different than the rest. It provides manipulatives, movies, and even demonstrations on lessons. There are also many games that students can choose from to teach them numerous math skills. The teacher or student can pick the grade level and feel comfortable with any of the materials available. There are resources from Kindergarten to High school.
IXL- There is so much I could say about this website. IXL provides practice and lessons on Math skills for grades K-12. It also provides teacher resources. If a teacher signs up for an account, IXL offers the option to upload a class roster. This allows students to have differentiated lessons. Along with Math, IXL has numerous resources for other subjects also.
Education World- This math site is a great resource for teachers. It is not a game site for students, but provides worksheets and resources for teachers. One great feature is it has a Lesson-of-the-Day. These lessons are fun and perfect for school today. This site provides lesson ideas, such as 5-Minute Lessons. Too much greatness on this site to talk about here. Go check it out!!