Yes! It can indeed be simplified.
\(\\ \\ \frac{51}{54} \\ \\ GCF = 3 \\ \\ 51 \div 3 = 17 \\ \\ 54 \div 3 = 18\)
You divide the numerator and denominator by the greatest common factor, and you will receive a new set of each. The new numerator is 17, and the new denominator is 18. Numerator = top, and denominator = bottom, so our new fraction is 17/18! Woo!