How to find the equivalent fractions​

Okay I’m pretty good at this but I’m not a thousand percent sure how to explain it. But on #5 you take the denominator of the second one (since it’s the one without a numerator) which is 48, you divide it by 8 which is 6, then you take 6 and multiply it by the numerator in the first fraction, which is 2, 2 times 2 equals 12 so the answer would be 12. Now on #9 you take 10 divide it by 2 you get 5, then you take 15 divide it by 5 to find the denominator which is 3.