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Old 18th February 2011 | 18:15
  #7 (permalink)  
G_STRING
 
Joined: Jul 2001
Posts: 162
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From: UK
Whirlygig is absolutely spot on (especially with the darts)!

If you have a smartphone, (iphone, etc), there are some really good mental maths aps that you can practice whenever you have a spare few minutes
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