Evaluate:

$\sqrt[3]{729}$

By prime factorisation:

$729=3 \times 3 \times 3 \times 3 \times 3 \times 3$

$=(3 \times 3 \times 3) \times(3 \times 3 \times 3)$

$\therefore \sqrt[3]{729}=(3 \times 3)=9$