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19x19 You can master mental arithmetic
19x19 Mental arithmetic method
Introducing the mental arithmetic method that enables you to perform mental arithmetic of multiplication from 11 to 19.
This method can be understood in minutes and mental arithmetic can be done on the spot.
Last updated on Mar 31, 2023
bug fix
Uploaded by
Jose Emilio Navarro Vázquez
Requires Android
Android 4.4+
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Calculation of 19x19
1.1.4 by Developer:FALCO
Aug 6, 2023