MathPlayground offers several seventh-grade online math games. Practice seventh-grade SAT math problems online, make block models of math problems with the game Thinking Blocks, play online Sudoku, Battleship, Mancala and Tangrams. You can also solve a virtual Rubik's Cube and play games involving percentages, angles, fractions, ratios, algebraic reasoning and graphing.
CoolMath has interactive games such as Algebra Crunchers, which generates an endless number of algebra problems for students to solve, to a collection of Brain Bender games which include animated logic puzzles and math games. APlusMath has a collection of online games including a hidden picture and Concentration card game played online using math problems to reveal cards. This site also has a math version of Bingo called Matho for addition, subtraction, multiplication and geometry.
The National Library of Virtual Manipulatives has dozens of math games. Number operations, algebra, geometry, measurements and data analysis are explored with these virtual games. Play probability games with virtual spinners, make histograms and bar charts, play with geoboards similar to old fashioned peg boards and string, play dominoes with shapes other than rectangles, and play with an online abacus. Dr. Mike's Math Games for Kids has several math games, including a 3D polyhedron puzzle magic trick, a traffic jam game which requires students to use problem solving and logic skills, several calculator puzzles, peg solitaire, and the classic game Mastermind.
FunBrain has an online amusement park of math games for middle schoolers. Play math baseball, soccer and football games, Math Car Racing, Fresh Baked Fractions or one of the other 20 animated math games on this site. On the Quai website, choose between subjects of math, algebra I and II, geometry and graphing, then choose the type of activity you would like. You can choose from online versions of math Battleship, Concentration, Hangman, matching games, online quizzes, puzzles, Web scavenger hunts and a simulated game show called Rags to Riches, which quizzes players about math topics.