Simplify (0.4) cubed

(4 * 1/10)^3

= 64 * 1/1000

= .064

To simplify (0.4) cubed, we simply need to multiply 0.4 by itself three times. Here's the step-by-step process to get the answer:

1. Multiply 0.4 by itself: 0.4 * 0.4 = 0.16
2. Multiply the result from step 1 by 0.4 again: 0.16 * 0.4 = 0.064
3. Multiply the result from step 2 by 0.4 one more time: 0.064 * 0.4 = 0.0256

Therefore, (0.4) cubed simplifies to 0.0256.