Subtractions : MATH Tower Defense.

This game has been designed to boost mental math strategies with subtractions. Story : Save the planet. Build and upgrade towers , use the magical subtraction power to win the game. Features: This is a tower defense game build in a narrative story. The player needs to work on his/her mental subtraction strategies to win the game against the invaders. -Discover fun levels to practice each strategy. . - Monsters' encyclopedia. - Fun and engaging Story mode. Contents: all mental strategies explained for subtractions : - reciprocity with additions -pass to tens . - compensation -distributive strategy - steps by steps guide ... - progressive learning of mental subtraction strategies through levels. Happy Gaming and Learning.