Question

how to do cube of 400​

Answer 1

${400}^{3} \\ = 400 \times 400 \times 400 \\ = {4}^{3} \times {100}^{3} \\ = 64 \times 1000000 \\ = 64000000$

hope it helps.

Answer 2

400 is not the perfect cube of any number but it is the square of 20