Use this link IXL:
https://www.futuristicmath.com/6th-grade-math-games.html
http://www.mathchimp.com/6th-grade-math-games .
FREE WEBSITES:
These is excellent sites. I believe they are making them free during this COVID period.
PEMDAS:
http://www.math-play.com/Order-of-Operations-Millionaire/order-of-operations-millionaire.html
https://www.free-training-tutorial.com/order-of-operations-games.html
ALGEBRA:
http://www.algebra4children.com/grade_game_algebraic%20expressions.html
http://www.algebra4children.com/time_challenge_game_algebraic%20expressions.html
https://www.iknowit.com/lessons/e-writing-algebraic-expressions.html
https://www.mathplayground.com/
http://www.kidsmathtv.com/7th-grade-math-games/
http://www.math4children.com/grade_7_games.html
http://www.sheppardsoftware.com/math.htm
https://www.education.com/games/math/
https://www.weareteachers.com/the-best-online-interactive-math-games-for-every-grade-level/
http://softschools.com/math/games/