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Mara Alagic IMECT 3 Cambridge July 2002
Technology-BasedRepresentations of Some Mathematical
Ideas
Mara AlagicWichita State University
Wichita, Kansas, USA
Mara Alagic IMECT 3 Cambridge July 2002
Teaching and Learning Mathematics
Standards-based teaching (NCTM, 2000)
Current findings about the nature of human learning (NRC, 2000)
Development of the IC technologiesTechnology Principle (NCTM, 2000)
Mara Alagic IMECT 3 Cambridge July 2002
Mathematics Teaching and Technology
Technology Principle: "Technology is essential in teaching and learning mathematics; it influences the mathematics that is taught and enhances students' learning" (NCTM, 2000)
Technology in context
Mara Alagic IMECT 3 Cambridge July 2002
Representations
Representing knowledge (Langer, 1989)
Problem-based representationsRepresentation standard (NCTM,
2000)Things before words, concrete
before abstract. (Pestalozzi,1803)
Mara Alagic IMECT 3 Cambridge July 2002
TRANSLATION BETWEEN MODES OF
REPRESENTATION
WRITTEN SYMBOLS
REAL-WORLD EXPERIENCE
MANIPULATIVES = CONCRETE
PICTURES
SPOKEN SYMBOLS
SPOKEN SYMBOLS
PICTURESMANIPULATIVES = CONCRETE
REAL-WORLD EXPERIENCE
WRITTEN SYMBOLS
Mara Alagic IMECT 3 Cambridge July 2002
Conceptual understanding via
multiple representations
Perception-based representationsMultiple representations External and internal
representationsProblem-based representationsTranslations among
representations
Mara Alagic IMECT 3 Cambridge July 2002
MENTAL MODELS/INTERNAL REPRESENTATIONS
EXTERNAL REPRESENTATIONS& TRANSLATIONS
Mara Alagic IMECT 3 Cambridge July 2002
"... the defining characteristic of knowledge workers is that they are themselves changed by the information they process"
Kidd (1994, p. 186)
Mara Alagic IMECT 3 Cambridge July 2002
Questions & Tasks: (Jaelyn & Barbie)
1. DEFINE TESSELLATION(S).
2. ARE THERE DIFFERENT TYPES OF TESSELLATIONS? EXPLAIN YOUR ANSWER.
http://www.mathacademy.com/pr/minitext/escher/index.asp
http://www.coolmath.com/tesspag1.htm
Mara Alagic IMECT 3 Cambridge July 2002
Have Fun Creating Tessellations (Jaelyn & Barbie)
Escher Web Sketch Linkhttp://www-sphys.unil.ch/escher/
Mara Alagic IMECT 3 Cambridge July 2002
Cultural Influences (Jaelyn & Barbie)
IN THE WEB SITES PROVIDED FIND 3 EXAMPLES OF TESSELLATIONS USED IN OTHER CULTURES.
Cultural references http://mathforum.org/sum95/suzanne/historytess.html Cultural tilling exampleshttp://www2.spsu.edu/math/tile/grammar/index.htm
Mara Alagic IMECT 3 Cambridge July 2002
Graphs and SlopeRobin Racette
y = -4x
b = 0; m = -4
-4/1 = down 4, right 1
4/-1 = up 4, left 1
2. y = -1/4x
b = 0; m = -1/4
-1/4 = down 1, right 4
1/-4 = up 1, left 4
Mara Alagic IMECT 3 Cambridge July 2002
More Slope Robin Racette
Try these on your own. y = 1/4x - 4
b = -4, m = 1/4
2. y = -3x
b = 0, m = 3
Graphing y = mx + b on the web
Mara Alagic IMECT 3 Cambridge July 2002
Adam the early bird
Starts at age 22
Invests $3000 for 6 years
At 11% interest
MillionaireMeredith, LuAnne & Dan
Mara Alagic IMECT 3 Cambridge July 2002
Brenda the procrastinatorStarts investing at age 28
Invests $3000 every year thereafter
Until age 63
At 11% interest
MillionaireMeredith, LuAnne & Dan
Mara Alagic IMECT 3 Cambridge July 2002
Who retires with the most? Meredith, LuAnne & Dan
Adam? Brenda?
And how much difference between the final results?
Plan A and B.xls
Mara Alagic IMECT 3 Cambridge July 2002
Invests $18,000Retires at age 63 with $1,128,249
Invests $108,000Retires at age 63 with $1,265,947
Meredith, LuAnne, & Dan
Mara Alagic IMECT 3 Cambridge July 2002
Graph of Sin and Csc Sarah
Things to Consider• Period?• Amplitude?• Asymptotes?
Differences?• Between function
and its inverse
Green Globs
Mara Alagic IMECT 3 Cambridge July 2002
Cos and Sin Wave
A C
time
D
D’
Sin
Cos
Sine/Cosine Tracer
D. Bennett 3/91
Geometer Sketchpad
Sarah
Mara Alagic IMECT 3 Cambridge July 2002
Tangent on a Circle
B
A
time
C
D
Tan
D. Bennett 3/91
Tangent Tracer
Geometer Sketchpad
Sarah
Mara Alagic IMECT 3 Cambridge July 2002
What if I still need help?Ask for helpWebsites
• http://www.drmath.com/• http://www.gomath.com/
Play Green Globs
AND…..
Sarah