User manual TEXAS INSTRUMENTS TI-15

[. . . ] TI-15 A Guide for Teachers TI. 15: A Guide for Teachers Developed by Texas Instruments Incorporated Activities developed by Jane Schielack About the Author Jane Schielack is an Associate Professor of Mathematics Education in the Department of Mathematics at Texas A&M University. She developed the Activities section and assisted in evaluating the appropriateness of the examples in the How to Use the TI-15 section of this guide. Important Notice Regarding Book Materials Texas Instruments makes no warranty, either expressed or implied, including but not limited to any implied warranties of merchantability and fitness for a particular purpose, regarding any programs or book materials and makes such materials available solely on an "as-is" basis. In no event shall Texas Instruments be liable to anyone for special, collateral, incidental, or consequential damages in connection with or arising out of the purchase or use of these materials, and the sole and exclusive liability of Texas Instruments, regardless of the form of action, shall not exceed the purchase price of this book. Moreover, Texas Instruments shall not be liable for any claim of any kind whatsoever against the use of these materials by any other party. [. . . ] Over a period of time, continue to introduce students to different types of number sentences to explore. - 8 < 5 (which has 13 whole number solutions) and ?= 24 (which has 8 solutions of whole number factor pairs) and ?x 4 = 2 (which has no whole number solution). 2000 TEXAS INSTRUMENTS INCORPORATED To display this equation on the calculator, put the calculator in Problem Solving mode by pressing the < key. The calculator display (1 SOL) tells how many whole number solutions there are to the equation. To test your solution to the equation, enter the value of 10 and press . The calculator will display YES. If an incorrect value is tested for ?, the calculator will display NO and provide a hint. For example, if a student tests 5 for the equation ?- 10= 5, the calculator displays NO, then shows 5 - 10 < 5, and then returns to the original equation. TI-15: A Guide for Teachers 34 What's the Problem?(Continued) Collecting and Organizing Data As an ongoing activity, have students work in pairs and use the What's The Problem?Student Activity sheet to create problem-solving cards. Have one partner create an addition, subtraction, multiplication, or division number sentence, using the "?" and record it in the top box and on the calculator. If possible, the other partner creates a situation and question to go with the number sentence and records it in the bottom box. The two boxes can be glued or taped to opposite sides of an index card. Have students work together with the calculator to explore how many whole number solutions the equation has and test what the solutions are. Provide ideas for exploration by asking questions such as: What actions could be happening in your story to go with addition (subtraction, multiplication, or division)?How could you use these counters to act out this number sentence?What could this number in the number sentence represent in your story?What could the question mark in the number sentence represent in your story?Can you make a story for a number sentence that begins with a question mark? Analyzing Data and Drawing Conclusions To focus students' thinking on the relationships between their stories and the numbers and operations in their number sentences, ask questions such as: How would using a different number here change your story?How would using a greater than or less than symbol instead of an equal sign in the number sentence change your story?How would using a different operation in your number sentence change your story? 2000 TEXAS INSTRUMENTS INCORPORATED TI-15: A Guide for Teachers 35 What's the Problem?(Continued) Continuing the Investigation Have partners create stories and trade them. Each partner can then write a number sentence to go with the other partner's story. [. . . ] You entered an invalid or incorrect equation; for example, 5++2 or missing parenthesis. Error following steps for using Op1 or Op2. The result is too large to fit within the boundaries of the display. Result is too small. 2000 TEXAS INSTRUMENTS INCORPORATED TI-15: A Guide for Teachers C-1 Support, Service, and Warranty Product Support D Customers in the U. S. , Canada, Puerto Rico, and the Virgin Islands For general questions, contact Texas Instruments Customer Support: phone: e-mail: 1-800-TI-CARES (1-800-842-2737) ti-cares@ti. com For technical questions, call the Programming Assistance Group of Customer Support: phone: 1-972-917-8324 Customers outside the U. S. , Canada, Puerto Rico, and the Virgin Islands Contact TI by e-mail or visit the TI Calculator home page on the World Wide Web. [. . . ]