Chapter 7

Chapter Objective:

* Two numbers can be compared by subtraction. Two or more numbers or quantities can also be compared by division and the comparison expressed as a ratio.

Vocabulary:

Ratio - A comparison of two or more quantities using division. Ex: The ratio of of 1 inch : 3 inches is equivalent to 1 ÷ 3.

Term (of a ratio) - Any one of the numbers in a ratio. In the ratio 4 : 5 : 8, the terms are 4, 5 and 8.

Equivalent ratios - Ratios that compare the same quantities. Ex: The ratios 1 : 4,  2 : 8,  3 : 12  and 4 : 16 are all equivalent ratios.

Simplest form (of a ratio) - A ratio in which the terms have only 1 as a common factor.          Ex: The simplest form of the ratio 4 : 12 : 8 is 1 : 3 : 2.

Greatest common factor - The greatest number that will divide two or more other numbers exactly.