Normally, never.
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None. Multiply numerator by the numerator and denominator by denominator.
yes. you multiply the numerator and denominator
There is normally no occasion when you would need to multiply the numerator and denominator of a fraction.
you multiply the numerator by the numerator and the denominator by the denominator.
Multiply the numerator of the fraction by 2 to get the new numerator. Multiply the denominator of the fraction by 3 to get the new denominator. Answer = (new numerator)/(new denominator).