Find the total volume, divide by 8, then take the cube root.<br><br>
&bull; Cuboid volume = 40 × 20 × 10 = 8000 cm&sup3;<br>
&bull; Each cube volume = 8000 ÷ 8 = 1000 cm&sup3;<br>
&bull; Side = \(\sqrt[3]{1000} = 10\) cm (since 10&sup3; = 1000)<br><br>
Final Answer: 10 cm