I still don't know exactly how to simplify fractions yet, and I have a huge test coming up! Can you please help?

Simplify a fraction by dividing some whole number into both the numerator and the denominator. If necessary, do it again until there is no longer a whole number that will divide evenly into both the numerator and the denominator, at which point the fraction is fully simplified. For example, to simplify 42/54, divide 3 into both numbers of the fraction: 42 ÷ 3 = 14, and 54 ÷ 3 = 18. So the fraction becomes 14/18. We're not done, however, because 14 and 18 are both divisible by 2: 14÷2 = 7, and 18 ÷ 2 = 9. So the fraction becomes 7/9. That's fully simplified, because no whole number (besides 1) will evenly divide into both 7 and 9. So 42/54 simplifies to 7/9.