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Página 95 - A number is divisible by 3 if the sum of its digits is divisible by 3.
Página 107 - Write the numbers in a, line, and divide by any prime number that will divide two or more of them without a remainder, placing the quotients and undivided numbers in a line below.
Página 294 - Trigonometry There is scarcely a College or Normal School in the United States that is not now using some of Prof. Olney's Mathematical -works. They are original and fresh— attractive to both Teacher and Scholar. Prof. Olney has a very versatile mind, and has succeeded to a wonderful degree in removing the difficulties in the science of Mathematics, and even making this study attractive to the most ordinary scholar. At the same time...