Find the volume of the big cube, then divide by the volume of one small cube.<br><br>
&bull; Big cube volume = 18&sup3; = 18 × 18 × 18 = 5832 cm&sup3;<br>
&bull; Small cube volume = 3&sup3; = 3 × 3 × 3 = 27 cm&sup3;<br>
&bull; Number of small cubes = 5832 ÷ 27 = 216<br><br>
Final Answer: 216