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How can you compute 9999^2 without a calculator?

 Jul 11, 2020
 #1
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9999= 9999  *  9999

     try this      9999 * 10 000      - 9999  

                       9999 0000   - 9999 

                                                = 9998 0001    with no calculator ! cheeky

 Jul 11, 2020
edited by ElectricPavlov  Jul 11, 2020

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