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Number Pad

September 9th, 2013

Why is there a dot on the number 5 on all number pads?

I noticed that every number pad like all phones and calculators have a dot over the number 5, why is that so?

In the early days, items with numeric pads, such as caculators and adding machines were used almost exclusively by accountants and the like. Since they had to perform a lot of caculations fast, most learned a method of using the keypad without looking at it. The dot was added as a reference point, so you could identify the 5 key by touch. I believe this method is still taught in typing classes.

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