Ratio and Proportions

Trotter, Barbara                     Ole A. Thorp
                                     545-0169
                           

Objectives

To read and write proportions
To identify the means and extremes of a proportion
To solve proportions
To solve problems using proportions
To make a scale drawing
 
Material Needed:

Overhead projector, transparencies, chalkboard, various samplings
of appropriate materials, including worksheets, and scale drawings.

Procedure:

The teacher will open the session with a daily review of changing 
fractions to decimal and decimals to percents, from 1/1 to 1/5.  The 
teacher will review the vocabulary (ratios, proportions, means, 
extremes, and scale drawings).  Students will give definitions in their 
own words with an example.  Teacher will then give several examples of 
ratios, soliciting verbal responses with examples from the class.  This 
step is then repeated with proportions, extremes, and the mean.  To 
determine if students have mastered the above concepts, they will 
complete a worksheet.  The teacher will assign various students to do 
the even numbered problems at the board and those students seated will 
do the odd numbers. The class will orally discuss the problems and 
answers.  The teacher will then give the class a model drawing of a 
house and boat.  The house will be increased by a 1 to 3 ratio, and 
then decreased by a 3 to 2 ratio.  The boat model will be increased by 
a 1 to 2.5 ratio.  The teacher will then close the session with the 
verbal drill.