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Vocabulary Lesson 1 Proportion – An equation stating that two ratios are equivalent. Rate – A ratio that compares two quantities of different units. Ratio – The comparison of two quantities, the ratio of and b is a:b or a to b or a/b, where b ≠ 0. Similar figures – Figures that have the same shape but are different in size. Unit rate – A comparison of two measurements in which one of the terms has a value of one. Denominator – The number b in a fraction a/b. If the faction is representing a part-whol relationship, denominator is the number of equally-sized parts that make the whole or the complete set. Difference – A number that is the result of subtraction. Associative Property – The way in which three or more numbers are grouped for addition or multiplication does not change their sum or product, respectively [e.g., (5 + 6) + 9 = 5 + (6 + 9) or (2 x 3) x 8 = 2 x (3 x 8). Fraction – A rational number expressed in the form a/b, where a is called the numerator and b is call the denominator. A fraction may mean part of a whole, ratio of two quantities, or may imply division. Numerator – The number a in a fraction a/b. If the faction is representing a part – whole relationship, then the numerator tells how many equal parts of the whole are being considered. Improper fraction – A fraction in which the numerator is greater than the denominator. Mixed number – A number consisting of an integer and a proper fraction.