If I'm doing this problem
18+25+72+16+9
I reorganize it like this
(18+72)+(25+15)+(1+9)
(90)+(40)+(10)
(90+10)+40
140
English
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Unfortunately its not quite that easy most of the time. :( [spoiler]I <3 u calculadora[/spoiler]
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Agreed
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So you reorganize to wear it's easier numbers to put together? I do that too.