### Volume 9, Number 18

 ```3 May 2004 Vol. 9, No. 18 THE MATH FORUM INTERNET NEWS Sketchpad Activities for Young Learners: Grades 3-5 David Bailey's World of Tessellations Statistics Every Writer Should Know SKETCHPAD ACTIVITIES FOR YOUNG LEARNERS: GRADES 3-5 http://www.keypress.com/sketchpad/syl/activities.html This collection of activities by Nathalie Sinclair and her colleagues offers examples of the ways in which Geometer's Sketchpad can be used across the range of mathematical subject areas in the elementary curriculum. Read about the activities, download individual sketches or use the link to download the entire collection of sketches, handouts, and teacher notes. These sketches require Sketchpad 4.0 or later: - Grouping I and II - Jump Along - Measuring Fish - Balance - Circles and Squares - Ghost Paths - RooBooGoo - Making a Kaleidoscope - Similarity - Stretching Ruler - Curved Path - Coordinate Geometry - Color by Numbers Introduction http://www.keypress.com/sketchpad/syl/index.html Geometer's Sketchpad http://www.keypress.com/sketchpad/ -|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|- DAVID BAILEY'S WORLD OF TESSELLATIONS http://www.tess-elation.co.uk The tessellations created by David Bailey are of a "representational" nature, as exemplified by M.C. Escher. - Birds (1) - Birds (2) - Birds (3) - Fish (1) - Fish (2) - Birds and Fish - Dimorphic - Counterchange - Parquet Deformations Bailey discusses tessellating polyhedra and Johannes Kepler's contribution to the study of tessellations. He also describes his own design process, and offers recommended links and references. \|/ TESSELLATION TUTORIALS http://mathforum.org/sum95/suzanne/tess.intro.html A series of tutorials by Suzanne Alejandre that demonstrate how to tessellate using HyperCard for black and white and/or HyperStudio for color, ClarisWorks, LogoWriter, templates, or simple straightedge and compass. The tessellation lessons include units incorporating rotations and glide reflections, a section called "Where's the Math?" that elaborates on some underlying geometric principles, comments contributed by others, and samples of student work. -|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|- STATISTICS EVERY WRITER SHOULD KNOW http://www.robertniles.com/stats/ Robert Niles writes, "Numbers can't 'talk,' but they can tell you as much as your human sources can. But just like human sources, you have to ask!" On his site he describes some of these basic concepts in statistics: - Mean - Median - Percent - Per capita and Rates - Standard Deviation and Normal Distribution - Margin of Error and Confidence Interval - Data Analysis - Sample Sizes - Finding Data on the Internet - Statistical Tests -|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|-\-/-|- CHECK OUT OUR WEB SITE: The Math Forum http://mathforum.org/ Ask Dr. Math http://mathforum.org/dr.math/ Problems of the Week http://mathforum.org/pow/ Mathematics Library http://mathforum.org/library/ Math Tools http://mathforum.org/mathtools/ Teacher2Teacher http://mathforum.org/t2t/ Discussion Groups http://mathforum.org/discussions/ Join the Math Forum http://mathforum.org/join.forum.html Send comments to the Math Forum Internet Newsletter editors Donations http://deptapp.drexel.edu/ia/GOL/giftsonline1_MF.asp Ask Dr. Math Books http://mathforum.org/pubs/dr.mathbooks.html _o \o_ __| \ / |__ o _ o/ \o/ __|- __/ \__/o \o | o/ o/__/ /\ /| | \ \ / \ / \ /o\ / \ / \ / | / \ / \ ```