Here is MATHS MASHUP - an arithmetic game from GamesWarp Studio. Targeted at kids from 1 to 92, especially those who want to brush up on basic maths.
Tiles will fall downward, like in a typical match 3 game, after the desired result is obtained. Use one of the mathematical symbols and plant it somewhere on the grid. Only single digits are used in the equation, so if you place a PLUS symbol between a row of 1234 and 5678, then the result obtained is 4 + 5 = 9. Horizontal and vertical equations are in play, diagonals are not.