jmc

Each page is assigned two numbers. We can generalize the numbers assigned to page $x$ to be the pair $x$ and $54-x$ for $1\le x\le 53$. That is, if $x=1$, then we can see that page number one is assigned the numbers $1$ and $54-1=53$. It is fairly easy to see that the units digits of $x$ and $54-x$ will only be the same if $x$ has a units digit of $2$ or a units digit of $7$. Thus, we simply must count how many such $x$ there are between $1$ and $54$. Possibilities for $x$ are: 2, 7, 12, 17, 22, 27, 32, 37, 42, 47, and 52. Therefore, there are $\boxed{11}$ such pages.