0

Calculate
13213-2

Solution Road

Correct answer:

11
Solution Road
Counting down from 1313 by 22 takes you to

119101112131415\begin{array}{cccccccccccccc} &&&&&-1&&-1&&&&& \\ & &&&&\curvearrowleft &&\curvearrowleft&& &&&&\\ 9&&10&&\underline{11}&&12&&\underline{13}&&14&&15&& \\ |&&|&&|&&|&&|&&|&&| \\ \hline \end{array}

So the answer is 1111.
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