I have an issue with making games too complicated, but I work at a low-level high school and they can do this. Requires 15 minutes familiarity with the ppt.
This has 2 games: Higher/Lower and Guess the price. For higher/lower just say, "Who thinks it's higher/lower?" After explaining how to verbally express numbers in English, write their guesses up on the board. Closest but not over wins.
This is similar to an existing price game, but uses more interesting products from
http://www.thisiswhyimbroke.com/Additionally, you can use my dice wheel if you ever want a dice roller in a game, as well as the calculator function.
Don't bother to download if you can't use pptx. Macros need to be enabled for the in-game calculator.