Calculate 10^3: Converting Powers to Integer Form

To solve the problem of finding $10^3$, let us apply the rules of exponents:

• Step 1: Recognize that $10^3$ means the base 10 is multiplied by itself three times.
• Step 2: Write out this multiplication: $10 \times 10 \times 10$.
• Step 3: Calculate the result step by step.
  First, calculate $10 \times 10 = 100$.
  Next, multiply the result by 10: $100 \times 10 = 1000$.

Therefore, the expression $10^3$ evaluates to 1000.

Thus, the solution to this problem is $1000$, which corresponds to choice 4.