[rmccue]

Seems reasonable to have the most frequently used numbers close to the user; I wonder if there might be something of Benfold’s law involved, where lower digits are more frequently used. https://en.wikipedia.org/wiki/Benford%27s_law

[EvanAnderson]

That's my intuition. I spent a lot of time entering stacks of checks into 10-key calculators at my family's businesses growing up in the late 80s and mid-90s. Most entry used the bottom two rows of digits (the zero, double-zero, and 1-3)-- a lot of $10, $20, and $30 checks.