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The arrows on the two spinners shown below are spun. Let the number $N$ equal $10$ times the number on Spinner $A$, added to the number on Spinner $B$. What is the probability that $N$ is a perfect square number? (2022 AMC 8 Problems, Question \#12) 
Overseas Competition->Knowledge Point->Calculation Modules
First, we calculate that there are a total of $4 \cdot 4=16$ possibilities. Now, we list all of two-digit perfect squares. $64$ and $81$ are the only ones that can be made using the spinner. Consequently, there is a $\frac{2}{16}=$ (B) $\frac{1}{8}$ probability that the number formed by the two spinners is a perfect square. 