Key to Adams's New Arithmetic

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Phillips, Sampson & Company, 1853
 

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Page 79 - Find the last term as before, then subtract the first from it, and divide the remainder by the ratio, less 1 ; to the quotient of which add the greater, gives the sum required.
Page 9 - The Least Common Multiple of two or more numbers is the least number which is a multiple of each of them; thus, 12 is the least common multiple of 2, 3, and 4.

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