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Activity: Hot Air Balloon
Go to: http://education.ti.com/.../Activity.do (opens a new window)
Description: This activity provides students with a visual for adding and subtracting integers and helps students understand that subtraction can be thought of as adding the opposite. A hot air balloon begins with a certain number of helium bags (providing lift) and the same number of sand bags (providing weight). The vertical position of the hot air balloon is determined by adding or removing a number of helium bags (representing positive integers) and sand bags (representing negative integers).
Technology Type: TI-Nspire 
Author: Texas Instruments
Language: English 
Cost: Does not require payment for use

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Courses: Math 5 Integers
Math 6 Integers
Math 7 Negative & zero, Integers
Algebra Add / Subtract