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If you are dividing the numerator and the denominator by the same number (the GCF), it is the same as dividing the fraction by 1, which will leave it unchanged and create the same product.
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.
Dividing by a non-zero rational number is the same as multiplying by its reciprocal.
After multiplying or dividing two rational expressions it is sometimes possible to simplify the resulting expression.
Converting a percent to its decimal equivalent is done by dividing by 100 (the same as moving the decimal two places to the left): 17.2 ÷ 100 = 0.172