A tale of two sets of numbers

It’s easy to take things for granted.

Take the numeric keyboards you use without a second thought every day.

Why is that on a phone keypad the numbers ascend in four rows from left to right 1 2 3 4 5 6 7 8 9 0 while on a calculator keypad they descend in four rows from right to left 9 8 7 6 5 4 3 2 1 0?

Obviously someone didn’t get the memo.