This section is from the book "The American House Carpenter", by R. G. Hatfield. Also available from Amazon: The American House Carpenter.

Factors placed in the form of a fraction as3/5,5/3,120/75 or

820/41 indicate division (Art. 382); the denominator (the factor below the line) being the divisor, and the numerator (the factor above the line) the dividend, while the value of the fraction is the quotient. Thus of the fraction,820/41= 20,

41 is the divisor, 820 the dividend, and 20 the quotient. From this we learn that division may always be indicated by placing the factors in the form of a fraction, so that the divisor shall form the denominator and the dividend the numerator.

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