[Trac #1249] Calculator cannot input negative numbers

[Zarro Boogs per Child]

#1249: Calculator cannot input negative numbers
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 Reporter:  bert                 |        Owner:  maurotorres
     Type:  defect               |       Status:  new        
 Priority:  high                 |    Milestone:  Trial-2    
Component:  calculator-activity  |   Resolution:             
 Keywords:                       |  
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Changes (by jg):

  * milestone:  Trial-1 => Trial-2

Comment:

 We need a fix for this, and/or a different calculator.

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Ticket URL: <http://dev.laptop.org/ticket/1249#comment:2>
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