$144 = 16 \times 9$, $256 = 16 \times 16$, yes — so $\frac{144}{256} = \frac{9}{16}$? No: $16 \times 9 = 144$, $16 \times 16 = 256$, so $\frac{144}{256} = \frac{9}{16}$? Wait: $\frac{144}{256} = \frac{144 \div 16}{256 \div 16} = \frac{9}{16}$ — yes, correct.