Round and round multiplication　Brain training and dynamic visual acuity drill

Features

• with a scoring function. No time limit. With sound effects.
• There is "round and round multiplication" problem is 50 questions to rotate.
• Shuffle (random) from 50 questions, you will not get bored because it is question is selected 10 questions.
• Please use to continue every day as a "brain training and dynamic vision training" drill.

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