The Normal, Or, Methods of Teaching the Common Branches: Orthoepy, Orthography, Grammar ...
The Normal, Or, Methods of Teaching the Common Branches: Orthoepy, Orthography, Grammar ...
Alfred Holbrook
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23, 33, 43, 53. By the first ru'a we have 3xllx23'x43x53=a L. CM. THEORETICAL ARITHMETIC. 323 By the second rule we have 53x43x3x11x23 =L. CM. 72. Demonstration of the rule for obtaining the L. C. M. by division. Take the numbers 6, 8, 9, 12, 15, 18, 20, 24, 25 ; divide these by 2, and we shall obtain the quotients and undivided numbers, 3, 4, 9, 6, 15, 9, 10, 12, 25. Now this divisor 2 will answer for all the first powers of 2 contained in any of the given numbers; consequently those first pow...ers of 2 are all rejected, and this divisor 2 is retained for them in the L. C. M. Dividing again by 2 we shall obtain the quo- tients and undivided numbers, 3, 2, 9, 3, 15, 9, 5, 6, 25. This second divisor 2 will answer for all the second factors of 2 in any of the given num- bers. It is therefore retained, a? a factor of the L. C. M. Dividing again by 2 we obtain 3, 1, 9, 3, 15, 9, 5, 3, 25. This third divisor 2 answers for all the third factors of 2 contained in any given numbers. Hence it is obvious that dividing by the several prime factors as long as two or more of the given numbers can be divided without a frac- tional quotient, is merely for the purpose of re- jecting superfluous factors, and retaining the necessary factors, for the L.
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