81. Definitions for geometry
    Finding definitions for geometry terms on the Web
    - Date of thread's last activity: 19 November 2003

82. Explaining the why's of multiplication place values
    Helping students understand why you "move over a place" when multiplying two- and three-digit numbers
    - Date of thread's last activity: 18 March 2009

83. Curious about fractions
    Using a "three arrow method" to add and subtract fractions
    - Date of thread's last activity: 23 October 2007

84. System of equations
    Teaching problem solving strategies to students working with systems of equations
    - Date of thread's last activity: 13 July 2007

85. Volume of a sphere
    Ideas for introducing students to determining the volume of a sphere.
    - Date of thread's last activity: 19 January 2012

86. Fractions w/manipulatives
    Using a recipe to show a real-world example in which people multiply and add fractions
    - Date of thread's last activity: 29 November 2006

87. How do I teach rounding to fourth graders who just don't seem to get it?
    Teaching rounding so that students understand, remember, and can apply it
    - Date of thread's last activity: 3 May 2013

88. Matrices versus Arrays
    Understanding the difference between a matrix and an array
    - Date of thread's last activity: 17 September 2007

89. Difference between "equation" and "number sentence"
    Comparing and contrasting common teaching terms
    - Date of thread's last activity: 23 January 2007

90. Converting repeating decimals to fractions
    Technique for converting repeating decimals to fractions
    - Date of thread's last activity: 28 October 2010

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