The numerator and denominator of a product of fractions are simply the products of the numerators and denominators respectively. That is,
a/b * c/d = (a*c)/(b*d).
The denominators can be the same or different - that is irrelevant.
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multiply the denominators
Multiply all numerators to get numerator of the product. Multiply all denominators to get denominator of the product. This is true whether the factors have like or unlike denominators.
You multiply the fractions until the denominators are equal. Then, you subtract.
multiply the fractions until they have common denominators and then subtract them
Multiply the numerators together then multiply the denominators. Reduce as needed.