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Message: <blockquote data-quote="Elcid" data-source="post: 6993346" data-attributes="member: 257071">[FONT=&quot]Multiply up to 19x19 in you head.[/FONT]  [FONT=&quot]It allows you multiply from 10 * 10 up to 19 * 19 without the use of a calculator or paper and pencil.[/FONT]  [FONT=&quot]For example consider 19 x 17. Imagine the larger number on the top row and take the last digit of the lower number  7 and add it to 19. 19 + 7 =26.[/FONT]  [FONT=&quot]Multiply the 26 x 10 = 260.[/FONT]  [FONT=&quot]Take the unit digits (9 x 7) = 63 and add them to the 260[/FONT]  [FONT=&quot]260 + 63 = 323.[/FONT]</blockquote>

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