The product of 0.4 × 0.04 × 0.004 is:

Correct option is C

Solution:

0.4 × 0.04 × 0.004 = $$(4 × 10^{-1}) × (4 × 10^{-2}) × (4 × 10^{-3})$$​​
Multiplying the coefficients: 4 × 4 × 4 = 64
Adding the exponents of 10: -1 + (-2) + (-3) = -6
So, the product is$$64 × 10^{-6}$$​, or 0.000064.
Therefore, 0.4 × 0.04 × 0.004 = 0.000064.