Playing games is a great way to develop problem-solving skills as well as practice skills in arithmetic. While a lot of games can be played electronically these days, there is something to be said for actually sitting down on the floor with some kids and building structures, manipulating shapes, or rolling dice and moving pieces around a board.
Strategy games are particularly good at helping develop problem-solving skills.
Math Games – building a foundation for mathematical reasoning
https://buildingmathematicians.wordpress.com/2020/08/22/math-games-building-a-foundation-for-mathematical-reasoning/
NRICH Strategy Games
https://nrich.maths.org/10020
Math Game Tutorials: Strategy Games
https://sis4teachers.org/2020/02/math-game-tutorials-strategy-games/
The Big List of Board Games that Inspire Mathematical Thinking
https://blog.mindresearch.org/blog/big-list-mathematical-board-games
Thinkfun Downloadable Strategy Games
https://www.thinkfun.com/teachers/strategy/
Game Directions
Farkle
http://www.boardgamecapital.com/game_rules/farkle.pdf
Granny Apples
http://www.gamewright.com/gamewright/pdfs/Rules/GrannyApples-RULES.pdf
Math Dice
http://www.mathdice.com/media/PDF/OfficialRules.pdf
Qwirkle
http://iloveboardgames.com/wp-content/uploads/2012/02/Qwirkle-Rules.pdf
Rack-O
http://www.hasbro.com/common/instruct/Racko(1987).PDF
Yahtzee
http://www.hasbro.com/common/instruct/Yahtzee_2004.pdf