NCTM Standards: Represent and analyze mathematical situations and structures using algebraic symbols; Understand patterns, relations and functions

Activity 28: Circumscribing a Circle about a Triangle

Added on 4/9/2008

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ACTIVITY OVERVIEW

In this activity we will:

  • Compare decimal numbers using the Number Line Application
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When you look at two numbers with decimals, how do you decide which one is bigger? We will use the NUMBER LINE application to help develop a method.  
Press the  key and arrow down to NUMLINE. Press  twice to get to the main menu 2: Fraction Line.  Press no alt text supplied
We want to compare 3.4 and 3.43. First we need to set the window. Set the window like the one on the right. Also arrow down and set the lower Indicator to off. no alt text supplied
Press graph to ensure that you are between 3 and 4
Now Press the  key and select 1: Draw label. Type 3.4 and press .

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Now type 3.43 and press .  Which number is bigger according to the number line? no alt text supplied
In order to attempt another problem, press the  key and select 2:ClrDraw and press . no alt text supplied
Now press again and select 1: DrawLabel to try a new problem no alt text supplied
Now try these try these problems to develop a strategy for comparing decimal numbers. no alt text supplied

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