A Mathematician’s Lament by Paul Lockhart
The Mathematical Problems of David Hilbert​
Are We Teaching PreCalculus Wrong
Exploring PreCalculus
Coping with Math Anxiety
Math Class Needs a Makeover  |  The Three Acts of a Mathematical Story
dy/dan  |  A difference

Metacognition

Slides
Handout
​See also Ten Metacognitive Teaching Strategies

Enrichment

What If
​Maths Timeline
NRICH
NCTM Problem of the Week
Math Contests and competitions
Curriculum inspiration
info graphic  Newton. Of Einstein. Of Riemann. Of Euler

Math History

MacTutor History of Mathematics
​Chronological History of Mathematics
History by Region

Topics, Tutorials

Making Mathematics Memorable, Meaningful, and Fun: Activities to Enhance Precalculus​
Khan Academy:  PreCalculus
Mathispower4u 
Exploring PreCalculus
​Visual Calculus
Topics in PreCalculus   |  Calculus
Lessons by Topics
Math Tutorials
​Math StackExchange:  Precalculus
​​Mathbits notebooks (coming soon)

Online Books

Precalculus:  An Investigation of Functions, David Lippman and Melonie Rasmussen
Precalculus OpenStax
College Algebra, Carl Stitz and Jeff Zeager
College Trigonometry, Carl Stitz and Jeff Zeager
Algebra and Trigonometry, OpenStax
 
Lit2Go Math collection
​​Mathematical Discovery
Euclid's Elements
British Society for the History of Mathematics

Caluculators

Graphing Calculator tutorials
Desmos

Interactives and Manipulatives

Intmath
​Annenberg

Games

Math Bits (PDF version)
Math Bits games (ppts)

Images and comics

SMBC4150

Podcasts

The Secrets of Mathematics

Additional Resources

NMC Lib guide:  Math
​OER: Math
OER Commons
Mathforum:  PreCalculus
Physorg:  Math
The Conversation:  Science and Technology