21. Plotting points on a graph
    When is it appropriate, and not appropriate, to connect the points on a graph?
    - Date of thread's last activity: 13 August 2009

22. Scale drawing
    Suggestions for finding corresponding measurements when making scale drawings.
    - Date of thread's last activity: 26 November 2007

23. Euler's formula
    Using Euler's formula to determine specifications for building a dome.
    - Date of thread's last activity: 11 December 2007

24. Outlier detection
    Methods of detecting outliers in bivariate data.
    - Date of thread's last activity: 15 December 2007

25. Fun ways to teach graphing and tallying to kindergarteners
    Ideas for engaging hands-on activities for teaching graphing and tallying to young children.
    - Date of thread's last activity: 30 November 2007

26. Estimation for kindergarteners
    Developing kindergarten students' ability to estimate quantities.
    - Date of thread's last activity: 20 December 2007

27. Division and multiplication in grade 3
    Strengthening the connection between multiplication and division when introducing concepts.
    - Date of thread's last activity: 2 January 2008

28. Place value
    Suggestions for ways to explore place value using bases other than 10.
    - Date of thread's last activity: 27 December 2007

29. Negative numbers
    Helping students to develop the concept of negative numbers. You CAN subtract a larger number from a smaller number!
    - Date of thread's last activity: 14 January 2009

30. Integers
    Suggestions for helping students understand multiplication and division with negative integers.
    - Date of thread's last activity: 17 January 2008

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