A rational number is a number which can be expressed in the form p/q where p and q are integers and p>0.
If p/q and r/s are two rational numbers then
(p/q)*(r/s) = (p*r)/(q*s).
You may need to check that this fraction is in its lowest (simplest) form.
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Dividing by a non-zero rational number is the same as multiplying by its reciprocal.
It the two rational numbers have different signs, then the answer will be negative, otherwise it will be positive.
The algorithm is A/B * C/D = AB/CD.
The product of two rational numbers, X and Y, is smaller than either of them if both are between 0 and 1.
It the signs of the two numbers that you are multiplying or dividing is the same, then the answer is positive, otherwise the answer is negative. Remember though, that division by 0 is not defined.