Concept:
Each term is obtained by dividing 900 by consecutive natural numbers.
Step 1: Observe the pattern.
\[
900=\frac{900}{1}
\]
\[
450=\frac{900}{2}
\]
\[
300=\frac{900}{3}
\]
\[
225=\frac{900}{4}
\]
\[
180=\frac{900}{5}
\]
Step 2: Find the next term.
\[
\frac{900}{6}=150
\]
Hence, the next number in the series is
\[
\boxed{150}
\]