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. M

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.