Math Trainer games (appinventor.ai_azaotl.The30Secs_Free) on Google Play

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The Designed is based on common core standar for Grade 2: "Fluently add and subtract within 20 using mental strategies.2 By end of Grade 2, know from memory all sums of two one-digit numbers."Improve your kids 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. Based on exercises from Kawashima Brain Training program.This FREE version focus on Addition equations.Best score is saved locally and also you can try to beat the best score from the world!Module Included in this version: 1.-Addition Modes: -Easy +: Basic Addition . Here second addend is < 6. -Hard + : Challenging Addition mode. Second addend is a random number between 1 and 9.4.- Just 1: Addition and substraction exercises. Special feature here is that Subtrahend is always the same number since the very beggining.If you like you may want to try the Full mathematica Version that has 4 modules: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. mathematica3.- +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.