Shinichi Kurogochi

Addition Matrix

Shinichi Kurogochi

Find the same number

Shinichi Kurogochi

Finding 3 numbers

Shinichi Kurogochi

Find Zero

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Ascending order

Shinichi Kurogochi

Audio Mental Arithmetic E

Shinichi Kurogochi

Press same 2 numbers

Shinichi Kurogochi

Addition drill of 3 numbers

Shinichi Kurogochi

Subtraction Matrix

Shinichi Kurogochi

音声暗算（日本語）

Shinichi Kurogochi

Memorize of numbers

Shinichi Kurogochi

Memory of position

Shinichi Kurogochi

Press number in order

Shinichi Kurogochi

Let's do Mental arithmetic

Shinichi Kurogochi

Number Crush

Shinichi Kurogochi