91. Algebra
    Teaching students the concepts that they were supposed to learn in previous school years
    - Date of thread's last activity: 20 August 2003

92. Mathematical Palindromes for Elementary Ed.
    The value of teaching about palindromic numbers in elementary classrooms
    - Date of thread's last activity: 23 January 2007

93. What is an array?
    Visual examples of arrays
    - Date of thread's last activity: 27 November 2012

94. Volume
    Finding the volume of a pumpkin; introducing the concept of volume
    - Date of thread's last activity: 25 March 2005

95. Rational and irrational numbers
    Activities and resources to help students understand rational and irrational numbers
    - Date of thread's last activity: 31 January 2007

96. Algebraic expressions and equations
    Tips for teaching students to solve algebraic equations and simultaneous equations
    - Date of thread's last activity: 25 May 2011

97. Tessellation shapes
    What kinds of shapes tessellate?
    - Date of thread's last activity: 28 October 2008

98. Problem solving
    Looking for ideas to improve problem solving skills
    - Date of thread's last activity: 26 April 2001

99. Notation
    Teaching notation
    - Date of thread's last activity: 29 April 2001

100. Where to find problems
     Where to find math problems
     - Date of thread's last activity: 30 April 2001

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