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(23) underline invert the unclear & proceed as in the multiplication /underline Thus formula. So formula.

81. When unclear many ratios are proposed to be compounded into one, or when many fractions are to be multiplied together it will shorten the operation to examine what common divisors the numerators & denominators have. For by dividing any one or more numerators, and any one or more denominators by those common divisors, the product will not be altered in its value but will be expressed in smaller numbers: it being evident for instance that formula; but this last expression is much more complex than the former. So in numbers, if 8/9, 9/10, 15/16, 8/9, 9/10, 8/9, 15/16, were proposed to be multiplied they might be placed & reduced thus, formula