Order of Operations
      http://www.amby.com/educate/ord-op/
         Practice solving problems using order of operations
      http://mathforum.org/dr.math/faq/faq.order.operations.html
         What is order of operations?  Why do we need it?
      http://www.aaamath.com/pro73c-order-of-operations.html
         Detailed explanation and example
      http://www.funbrain.com/algebra/index.html
         A game that uses order of operations
      http://www.math.com/school/subject2/lessons/S2U1L2GL.html
         How to and practice
      http://www.purplemath.com/modules/orderops.htm
         What it is and how to
      http://www.sosmath.com/algebra/fraction/frac3/frac39/frac39.html
          Explanation and some problems to try
      http://www.aplusmath.com/cgi-bin/Worksheets/Online_Order_Of_Operations
          Practice with answers button!
      http://www.blarg.net/~math/order.html
          Evaluate and solve using order of operations
      http://www.mathdork.com/lessons.html
          Click on the "view free" for the Golden Rule Of Algebra