Which of the following is a good way to quickly determine whether 3/12 and 1/4 are equal

For this case we must indicate a form to determine if the following expressions are equal:

It is observed that if we multiply the numerator and denominator of the second fraction by "3" we obtain the first fraction:

Similarly, if we divide the numerator and denominator of the first fraction between "3" we obtain the second fraction.

ANswer:

Divide the numerator and denominator of the first fraction between "3"  or

Multiply the numerator and denominator of the second fraction by "3"

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