## Browse - High School (9-12)

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1. Formula for volume of cones/pyramids
A physical demonstration of the fraction 1/3 in the volume formulas for cones and pyramids.
- Date of thread's last activity: 20 January 2012

An activity to help students discover the relationship between slopes of perpendicular lines.
- Date of thread's last activity: 1 November 1998

3. Probability
Suggestions for teaching probability.
- Date of thread's last activity: 30 October 1998

4. Functional, life math skills for autistic teenager
Math resources for autistic high school student with math difficulties.
- Date of thread's last activity: 9 February 2015

5. "Bottoms up" as a method to factor trinomials
A method for factoring trinomials and why it works.
- Date of thread's last activity: 19 January 2015

6. Rigor
What is rigor in math education? This offers a perspective on how much and what kind of rigor is appropriate.
- Date of thread's last activity: 24 May 2006

7. Foundations of Math - block schedule
How to organize a 95-minute instructional block in a middle school math class.
- Date of thread's last activity: 10 December 2007

8. 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

9. 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

10. Which algorithms should we still teach in high school?
With technology available in classrooms, should we be teaching the square root algorithm? Cramer's rule? Descartes rule of signs?
- Date of thread's last activity: 10 November 2006

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