http://www.dositey.com/math/m/mystery1AM.htm - game not hard
http://regentsprep.org/Regents/Math/orderop/Torder.htm - game easy
http://classroom.jc-schools.net/basic/math-order.html - game easy to learn
http://www.theproblemsite.com/games/onetoten.asp - game easy to learn
http://www.mathgoodies.com/lessons/vol7/order_operations.html - pemdas
http://www.mathgoodies.com/lessons/vol7/operations_exponents.html - pemdas
http://en.wikipedia.org/wiki/Order_of_operations - pemdas
http://www.austincc.edu/tutor/students/resources/Order%20of% 20Operations.pdf - pemdas
http://www.mathcats.com/grownupcats/ideabankorderofoperations.html - pemdas
http://www.purplemath.com/modules/orderops.htm - pemdas
