What do the following numbers have in common?

•36, 25, 49, 9, 4, 16, 64, 81

These are all numbers you get as a result of squaring another number (multiplying it by itself). They are

called perfect squares.

• What numbers can be multiplied by themselves to get the following numbers?

• 1) __ x __ = 49

• 2) __ x __ = 36

• *This number that you multiplied by itself to produce a product (answer to a multiplication question) is the square root of that product.

• So the square root of 49 is _____ and the square root of 36 is_____

Square RootsA number that when squared equals the given number.

Practice

• Quiz yourself http://www.studystack.com/studytable-5224

• Practice with a game of tic-tac-toe http://www.funbrain.com/cgi-bin/ttt.cgi

Challenge

• If you were asked to approximate the square root of 10 what would you do?

• Take a few minutes brainstorm with your group.

Challenge Response

• Use your knowledge that 3x3 gives you the perfect square 9, and 4x4 gives you the perfect square 16.

• The square root of 10 is then likely a decimal in the 3’s. You could approximate that the square root of 10 is 3.1

Activity

• Create a floor plan for a square space. You must tile your floor with a tile amount that amounts to a perfect square. Once complete write the perfect square beneath your plan as well as the square root. Additionally you must label the dimensions of your square and label the room!