This is so you can become an expert touch-typist with the calculator. Most number pads and 10-key calculators feature a tiny raised bump or nodule on the "five" key. It can be challenging for those with not-so-graceful outer digits, but you'll develop the dexterity in your little finger and thumb, and it will speed things up tremendously over time. Using the thumb and pinky fingers on the zero and equals/functions keys help. Each works the numbers above and below that row, too. The middle finger gets positioned on the five and the index over the four, and the ring over the three. There are great practical training programs available on the internet, but the gist of these is that the index, middle, and ring finger do most of the work on a 10-key number pad.
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