Evaluate:

(i) $(8)^{3}=(8 \times 8 \times 8)=512$.

Thus, the cube of 8 is 512 .

(ii) $(15)^{3}=(15 \times 15 \times 15)=3375$.

Thus, the cube of 15 is 3375 .

(iii) $(21)^{3}=(21 \times 21 \times 21)=9261$.

Thus, the cube of 21 is 9261 .

(iv) $(60)^{3}=(60 \times 60 \times 60)=216000$.

Thus, the cube of 60 is 216000 .