GoSum
© 2012 Aaptek Ltd
Like a crossword-puzzle with numbers, this ad-infested multi-player app asks you to place numbered tiles on a board to achieve points. The free version is hard to figure out. To play, you drag number and function tiles (for addition, subtraction, multiplication and division) onto a shared gameboard, to build off each others equations, not unlike Words With Friends. Features include: play 2, 3, or 4-player games. Prices are $2.99 for iPad and $0.99 for iPhone.
$2.99, iPad, iPhone
Teaches: math, math facts