Arithmetic

• Dividing the Estate

  

  In this puzzle we invite you to figure out how to divide up this estate as specified in the will. read more  

• Hours, Minutes, and Seconds

  

  A clock is a complicated measuring device. There are three scales superimposed on each other, one for hours and one for minutes and one for seconds. read more  

• Is It a Sale?

  

  A crowd gathered outside the electronics store. The window display was filled with radios, TVs, computers, and other electronic devices. read more  

• Magic Squares

  

  Magic squares puzzles are among the most ancient in mathematics. Can you create magic squares with the numbers 1-9? read more  

• Make It True

  

  See how many true mathematical sentences you can make out of a given collection of numbers. read more