**A Calculated
Answer**

As we left the people mover, we saw a large sign with large numbers.

1478945

852

7410369

987454123

Almost immediately, slowly at first,
Ozzie started *calculating* using the calculator with no
batteries. He found that as you entered the digits, the pattern
on the keyboard spelled out letters. The letters spelled out
"FIVE". This was the last puzzle and we turned in our
answers. We were confident of two answers, and knew we were
guessing on the rest. We took almost exactly the whole allowed
hour.