Question - Fill in the Blank for a Simple Multiplication Equation
Solution:
\[
\begin{align*}
6 \times 9 &= 6 \times (5 + \boxed{4}) \\
54 &= 6 \times 9 \\
54 &= 6 \times (5 + 4) \\
54 &= 6 \times 5 + 6 \times 4 \\
54 &= 30 + 24 \\
54 &= 54 \\
\text{Hence, the missing number is } \boxed{4}.
\end{align*}
\]
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