Place four pennies at the vertices (corners) of th square below. The sides of this square are about 10 cm long, when measured from the centers of the coins. Your challenge in this puzzle is to move only two coins so that you form another square that is smaller. This new square has sides that are about 7 cm long. Sketch your solution on the back of your worksheet.
(Note: if the dimension don't match the stated ones above on your print out, don't worry the puzzle is still solvable.)
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I hope that you and your students enjoy this challenge.