Addition and Substraction (appinventor.ai

Addition and Substraction (appinventor.ai_azaotl.The30Secs) on Google Play

Improve your children mental calculation abilities. Just with 30 seconds tests no more. This can provide a quite stressing and motivating way to improve mental calculation. Forget about long tests and distracting graphics, this is neat, clean and effective.This version focus on Addition and Substraction equations. Best score is saved locally and also you can try to beat the best score from the world!Addition and Substraction are based on the following patterns:AB + C = AB - C =4 modes of game: 1.-Addition Modes: -Easy +: Basic Addition . Here second addend is < 6. -Hard + : Challenging Addition mode. Second addend is a random number between 1 and 9.2.- Substraction Modes: - Easy - : Basic substraction. The Minuend is a random number < 60 and Subtrahend is a random number < 6 -Hard - : Challenging Substraction mode: Minuend is a random number <100 and Subtrahend is a random number <10.3.- +3Secs mode: Addition and substraction exercises, if you answer correctly you get a bonus of 3 seconds more. 4.- Just 1: Addition and substraction exercises. Special feature here is that Subtrahend is always the same number since the very beggining.Keywords: Math,trainer,addition,substraction,mental calculation,