Here are some useful and interesting links that I have found:
1) GeoGebra: Here is a free mathematical program that I highly recommend downloading for current and future use. http://www.geogebra.org/cms/
2) CutOutFoldUp: http://www.cutoutfoldup.com/
This is a website with mathematical foldables ranging from easy to very difficult.
3) A discussion of measuring rational vs irrational numbers: http://mathforum.org/library/drmath/view/54660.html
4) Tesselations: http://www.tessellations.org/
2) CutOutFoldUp: http://www.cutoutfoldup.com/
This is a website with mathematical foldables ranging from easy to very difficult.
3) A discussion of measuring rational vs irrational numbers: http://mathforum.org/library/drmath/view/54660.html
4) Tesselations: http://www.tessellations.org/