Jogos de adição e subtração

Adição

http://www.fun4thebrain.com/addition/addedgemoor.html
http://www.fun4thebrain.com/addition/addmilkshake.html
Subtração
http://www.fun4thebrain.com/subtraction/subPeabody.html
http://www.fun4thebrain.com/subtraction/goneBananas-Subtraction/bananasSub.html

Adição e subtração
http://www.guri.com/guri.htm
http://www.fun4thebrain.com/