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Mayan calendar, 2012, the end of the world.

About 2012, the end of the world and Maya

Gregorian to Mayan calendar conversionCreative Commons Attribution/Share-Alike License 3.0 (Unported)
 

Multiplication in columns

Calculator shows results of multiplying in columns, can be used to check answers

Multiplication in columnsCreative Commons Attribution/Share-Alike License 3.0 (Unported)

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