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To simplify \( 1000^{2/3} \), we start by rewriting 1000 in terms of powers of 10:
\[
1000 = 10^3
\]
Now, substituting this into the expression:
\[
1000^{2/3} = (10^3)^{2/3}
\]
Using the properties of exponents, we can simplify this further:
\[
(10^3)^{2/3} = 10^{3 \cdot (2/3)} = 10^2 = 100
\]
Therefore, the correct simplification of \( 1000^{2/3} \) is \( 100 \).
Thus, Kali has the correct value.