Makoto Urakawa

The "Soroban" is an abacus developed in Japan.This App is a simulator of an "Soroban". There is a function of undoing and redo. 免費玩Simple Soroban APP玩 …

It is the apps for training of Flash Mental Arithmetic. Since 'Indication time' and 'Interval' can be set up finely in addition to 'Numbers' and 'The …

Application for counting a number.There are 1 button mode and 3 button modes.There is also a minus button so that it can correct, when it makes a mist …