31. Modeling Subtraction of Integers using Red and Yellow Counters
    How to model addition and subtraction of integers with manipulatives.
    - Date of thread's last activity: 23 January 2009

32. Manipulatives for square roots
    Helping students understand square roots visually when they're not dealing with perfect squares.
    - Date of thread's last activity: 4 December 2007

33. Code breaking - History
    Including history when teaching encoding and decoding using matrices. Was the Enigma machine based on matrices or another encryption technique?
    - Date of thread's last activity: 20 January 2012

34. Algebra and the # symbol
    Using # to express a function. How do you solve it?: If a#b = 3a + 2b, find 5#6.
    - Date of thread's last activity: 4 March 2008

35. The geometry of the complex roots of graphs
    Interesting way of looking at the geometry of the complex roots of graphs
    - Date of thread's last activity: 13 September 2012

36. Distributive property using manipulatives
    Teaching the distributive property to students whose first language is not English.
    - Date of thread's last activity: 4 January 2012

37. Graphing: discrete vs continuous data
    How do you know when to "connect the dots" on a graph and when not to?
    - Date of thread's last activity: 24 September 2010

38. Teaching algebra to a non-English speaker
    Techniques for teaching algebra to a Spanish-speaking student
    - Date of thread's last activity: 2 December 2007

39. Determinant used to find the area of a triangle given the three vertices
    Finding the area of a triangle using determinants
    - Date of thread's last activity: 7 December 2006

40. Solving algebraic equations
    Teaching students to solve equations with a single variable
    - Date of thread's last activity: 20 June 2011

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