Texas Instruments

Calculators in Our Classrooms

By Jennifer Holland1History of CalculatorsWilliam Seward Burroughs (1885) invented the first practical adding and listing machineWilliam W. Hopkins (1901) invented the Standard (front-runner to the 10-key machine)Todays 10-key design was introduced by Oscar J. Sundstrand in 1914First handheld calculator designed by TI in 19662

http://TI timeline

3History of TIStarted by John Carence Karcher and Eugene McDermott in early 1930Firm incorporated as Geophysical Service, or GSI on May 16, 19301938GSI begins efforts to separate oil interests from geophysical exploration1945Honored by Navy for contribution to war effort

41951Name changed to Texas Instruments Incorporated; GSI becomes subsidiaryStarts geophysics summer program for college students1952TI-GSI Foundation formed to support education and community1952TI enters semiconductor business with purchase of transistor license

51958Jack Kilby invents integrated circuit1961First Ethics in the Business of TI booklet printed1966First mention of software in annual report1956GSI scholarship fund created

61959TI donates semiconductors kits to colleges and universities; semiconductor department works with Lighthouse for the Blind1969Kilby awarded National Medial of Science in a ceremony in the East Room of the White House on February 161973Eugene McDermott, founder of TI dies at age 74

71982Jack Kilby inducted into National Inventors Hall of Fame1990TI Foundation funds model Head Start program2000Jack Kilby awarded Nobel Prize in physics

8TI Ethics5th printing"We will not let the pursuit of sales, billings, or profits distort our ethical principles. We will always place integrity before shipping, before billings, before profits, before anything. If it comes down to a choice between making a desired profit and doing it right, we don't have a choice. We'll do it right. We must do it right, in every detail. Expedient compromises or short-cuts for near-term gains are not acceptable.--Jerry Junkins,Chairman, President, and CEO9Number Munchers

http://www.youtube.com/watch?v=CeMvJcfBDLM10Elementary School Calculators

11Middle School Calculator

12

13High School Graphing Calculators

14TI-89 Titanium

15TI-92 Plus

16Voyage 200

17TI Connect SoftwareAllows you to connect your calculator to your computer.Most often used to capture screens

18Exercise 11.) Graphing: Limacons, rose curves, circles and lemniscates

19Rose Curve

20Exercise 22.) Graph the piecewise function f= -x-2, x -1x3, -1 x 11, x 1

21Exercise 2

22Exercise 2

23Exercise 3A student wonders if tall women tend to date taller people than do short women. She measures herself, her sister, and the women in the adjoining dorm rooms. Then she measures the next person each woman dates and obtains these data on handout (in inches).Based on a scatterplot, do you expect the correlation to be positive or negative? Near 1 or not?Find the correlation r between the heights of the women and their dates24Exercise 3

25DiscussionIn what other contexts could calculators be used in our classrooms?26