Find the missing number

Question

390x ? = 390.000
10 second power
10 to the third power
10 to fourth power
10 to the fifth power

Answer 1

To find the missing number $x$ in the equation $390x=390.000$, we first need to understand what $390.000$ represents in terms of powers of ten.

The expression $390.000$ can be interpreted as:

$$390.000=390\times {10}^0$$

The equation then becomes:

$$390x=390\times {10}^0$$

To solve for $x$, we can divide both sides by 390 (assuming $390\ne 0$):

$$x={10}^0$$

Since ${10}^0=1$, we find that:

$$x=1$$

Now, regarding the powers of ten mentioned (10^2, 10^3, 10^4, 10^5), these are just other forms of expressing numbers but don't change the value of $x$ in this context.

Thus, the missing number $x$ is:

$$\boxed{{\displaystyle 1}}$$