You cannot, since being divided by a number is the same as being multiplied by the reciprocal of that number.
For example, (2/3) / (5/4) = 8/15 and (2/3) * (4/5) = 8/15
The only time that you can be sure is if the result is zero. In that case, the fraction has been multiplied by 0. The reciprocal of 0 does not exist and so the operation could not have been division by 1/0.
proportion are fraction that are being cross multiplied to find an answer
It is called multiplication!
In multiplication, the number being multiplied is called what
If the two numbers that are being multiplied or divided have the SAME sign, the answer is positive, if they have DIFFERENT signs, the answer will be negative.
Being a divisor isn't an inherent property of a number. Rather, whether or not a number serves as a divisor depends on how a fraction is formulated. For example, in the fraction 18/6, 18 is the dividend, or the number being divided, 6 is the divisor, or the number the dividend is being divided by, and 3 is the quotient, or the result of the division.
To divide a fraction by a fraction you multiply the first fraction, or dividend (number being divided), by the reciprocal (reversed, numerator becomes denominator and denominator becomes numerator) of the divisor (number dividing the divisor). In this case, 3/4 would be multiplied by 6/1 and the answer would be 18/4. Hope this helps :)
numerator
It is the numerator.
The value of the fraction is 1.
The numerator is divided by the denominator in a fraction as for example 3/4 = 0.75 as a decimal.
To divide a fraction by a fraction you multiply the first fraction, or dividend (number being divided), by the reciprocal (reversed, numerator becomes denominator and denominator becomes numerator) of the divisor (number dividing the divisor). In this case, 6/7 would be multiplied by 7/36 and the answer would be 42/252, which can be reduced to 1/6. Hope this helps :)
It is called the dividend.