Justice Adams's Proportion Presentation ("EXPERT Math Project")
Proportions for Pros Honors Math/3rd Period Ms. Shelly Brown-Jones 7-5Presented by Justice Adams
Objective• To define a proportion and its parts and terms.• To exemplify the method of determining what constitutes a proportion and what does not (and to establish proportion to find missing terms).• To demonstrate examples of proportions and non-proportions.
Testing Proportions• Cross products are used to test whether two ratios are equal and form a proportion. • Cross products are determined by simply cross- multiplying a given pair of ratios. • An equal (=) or not equal sign (≠) is used to correspond with whether or not the products are equal or are a proportion.
Summary• A proportion exists when two ratios are equal. Whether a pair of ratios is equal or not equal is determined by multiplying extremes by means or cross-multiplying the given set of fractions. Cross products and other methods are also used to solve word problems using proportions, and generally to find a missing term in a proportion.
ResourcesOnline Math Assistance• Visit www.math.com or www.mathisfun.com for assistance with proportions and other math problems.Typing Equations 1. To type an equation in PowerPoint (or Microsoft Word) click the “Insert” tab at the top of the screen and then the “Equation” icon. 2. Type what you would like to be converted into a proper equation into the equation box (type the forward slash / between the numbers, without spaces, to get a proper fraction). 3. Click enter.Typing Mathematical Symbols• To type mathematical symbols, like the “not equal to” sign (≠), etc., click the “Insert” tab and then “Symbol” to select the appropriate symbol. Click insert.