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Activity Overview |
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In this activity, students use the number line to investigate subtraction of integers and to justify and support the rules they develop.
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Before the Activity |
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Access the NUMLINE application. and set up a number line with minimum value -40, maximum value 40, scale 5, and starting point 0
If you do not have NUMLINE application download it from: < a href="http://education.ti.com/educationportal/sites/US/productDetail/us_number_line_73.html">NUMLINE App
See the attached PDF file for detailed instructions for this activity
Print pages 17 - 22 from the attached PDF file for your class
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During the Activity |
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Distribute the pages to the class.
Follow the Activity procedures:
Add a positive integer and a negative integer x + (- y ), where x > y, and observe that the vectors on the number line point in opposite directions
Subtract y directly from x, x - y, where x > y, and observe that the vectors point in opposite directions
Observe that adding a negative integer to a positive integer looks just like subtracting a positive integer from a positive integer
Compute x + (- y) and y - x, where y > x and note the result
Note that subtracting a number is the same as adding the opposite number
x - y = x + (- y)
x - (- y) = x + y
Verify these statements with the calculator and solve similar problems
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After the Activity |
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Students complete the Student Activity sheet.
Review student results:
As a class, discuss questions that appeared to be more challenging
Re-teach concepts as necessary
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Other Downloads |
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view standards alignment
view textbook alignment
Subject Area:
Math : Middle Grades Math : Number Sense
Author:
Texas Instruments
Level:
5-8
Activity Time:
60 Minutes
Device:
TI-73 Explorer™
Apps:
Software:
TI Connect™
Accessories:
TI Connectivity Cable
Other:
This is Activity 2 from the EXPLORATIONS Book:
Walking the Line: Activities for the TI-73 Number Line.
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