1. (5 points) Calculate: $1100 \div 25 \times 4 \div 11=$
【Analysis】First calculate $1100 \div 11 \div 25$, which gives 4, then calculate $4 \times 4$
【Solution】Solution: $1100 \div 25 \times 4 \div 11$
$$
\begin{array}{l}
=1100 \div 11 \div 25 \times 4 \\
=100 \div 25 \times 4 \\
=4 \times 4 \\
=16
\end{array}
$$

Therefore, the answer is: 16