**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.

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