This is japanese right brain training called Flash Anzan.You add all numbers popping up one after another.This mental arithmetic application will make you able to perform hundreds calculations a minute.If you fall into a slump, you should remember following words.Dont think.
FEEL!(Bruce Lee)Main function:Speed range (4.0sec - 0.15sec)Number of Digits (1 - 5)Number of calculation times (5 - 100)Including negative number or notFix number of digits or notTo save the percentage of questions answered correctlyTo retry the previous questionTo start again where you left off
https://andro.io/app/mentalcalculation
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