1 Minute Mental Arithmetic vs Math Training - Calculation -使用状況と統計
Do mental arithmetic for 1 minute every day to train your brain.
It also helps the child learn the calculations.
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You can choose levels you like from various levels of problems.
This is helpful for abacus training, too.
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1 Minute Mental Arithmetic VS. 
Math Training - Calculation -1月 11, 2025