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Anzan19x19


4.8 ( 2448 ratings )
Eğitim Eğlence
Geliştirici: Hajime Hotaka
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Method of mental calculation of 19x19

Provides a completely new mental method of multiplication from 11 to 19

This method can be understood in a few minutes and can be calculated on the fly.Provides a new mental calculation method of multiplication from 11 to 19.