Activities

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- Before the Activity Files
- Teacher Notes Appendix A PDF
- Teacher Notes Appendix B PDF
- Teacher Notes Appendix C PDF
- Teacher Notes Appendix D PDF
- Teacher Notes Appendix E PDF
- Teacher Notes PDF
Alignment
- Standards Alignment
- Textbook Alignment
Subject Area
- Maths: Algebra I: Sequences and Series
Author

Texas Instruments
Level

6-8
Activity Time

60 Minutes
Device
- TI-73 Explorer™
Other Materials

This is Activity 8 from the EXPLORATIONS Book:
Discovering Mathematics with the TI-73: Activities for Grades 7 And 8
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Let's Do Summagic

Activity Overview

Students learn to quickly add lists of numbers by adding like terms and using the distributive property.

Before the Activity

See the attached PDF file for detailed instructions for this activity

Print pages 69 - 72 from the attached PDF file for your class

During the Activity

Distribute the pages to the class.

Follow the Activity procedures:

Choose two numbers, a and b as the first two terms in a sequence of ten numbers

Generate the next eight terms in the sequence where each number is equal to the sum of the two preceding numbers

Use the distributive property to find the number of a's and b's in the sequence

Observe that there are 55 a's and 88 b's in the sequence

Notice that 55a + 88b gives the sum of the sequence

Observe that (11 * the seventh term of the sequence) also results in the sum of the sequence

After the Activity

Students will complete the Worksheet and analyze the results.

Review student results:

As a class, discuss questions that appeared to be more challenging

Re-teach concepts as necessary

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Before the Activity Files

Alignment

Subject Area

Author

Level

Activity Time

Device

Other Materials