Number Sense

• All the People in the World

  

  The world population is growing rapidly. At the same time, we are faced with global warming, destruction of rain forests . . . read more  

• How Long Is the Coast of England

  

  …asked mathematician Benoit Mandelbrot. Our math puzzle this month explores a related question. read more  

• How Thick Does It Get?

  

  This puzzle was suggested by Malcolm Gladwell's book The Tipping Point. read more  

• Number Series

  

  Can you figure out the patterns in several number series.  read more  

• Power to the Pedal!

  

  Have you ever wondered whether the power of a bicycle could be harnessed to do useful work . . . read more  

• Square Numbers

  

  All these math puzzles are somewhat related to each other.  read more  

• The Great Soccer Ball Giveaway

  

  The Seedonia National Soccer Team (the Seedies) made it to the final sixteen in World Cup Soccer for the first time . . . read more  

• The Reward

  

   The king of Seedonia was driving along a winding mountain road with his son. read more