Factors/multiples/gcf/lcm
http://www.math-play.com/Factors-and-Multiples-Jeopardy/factors-and-multiples-game_html5.html
Exponents:
http://www.mathgametime.com/games/otter-rush-exponents-game
PEMDAS
http://www.mathgametime.com/games/make-24
http://www.math-play.com/Exponents-Jeopardy/exponents-jeopardy-math-game_html5.html
Creating expressions:
1 Variable Equations:
http://www.sheppardsoftware.com/mathgames/Numberballs_algebra_I/numberballsAlgebraI.htm
1 missing equation - variable as a ? multiplication
http://www.mathgametime.com/games/swimming-otters-variable-expression
1 variable equations- decimals
2-variable equations
http://www.aaamath.com/g816b_x1.htm
http://www.math-play.com/equations-jeopardy/equations-jeopardy-game_html5.html