Rays Algebra Part First On the Analytic And Inductive Methods of Instruction
Rays Algebra Part First On the Analytic And Inductive Methods of Instruction
Joseph Ray
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Art. 122* — If ice multiply the numerator of a fraction, without changing the denominator, the value of the fraction is increased as many times as there are units in the multiplier. If we multiply the numerator of the fraction f by 3, without changing the denominator, we get f. Thus: 2X3_6 7 ~7 Now, f and f have the same denominator, and, therefore ex- press parts of the same size; but the second fraction, f, has three times as large a numerator as the first, f ; it therefore expresses three ti...mes as many of those equal parts as the first, and is, con- sequently, three times as large. And the same may be shown of any fraction whatever. PROPOSITIOiV II. Art. 123* — If ice divide the numerator of a fraction, withoid changing the denominator, the value of the fraction is diminished, as many times as there are units in the divisor. If we take the fraction |, and divide the numerator by 2, with- out changing the denominator, we get i. Thus : 4-^22 5 ~5 Now, 4 and f have the same denominator, and, therefore, ex- press parts of the same size ; but the numerator of the second fraction, §, is only one half as large as the numerator of the first, I ; it therefore expresses only one half as many of those equal parts as the first, and is, consequently, only one half as large.
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