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The calculator keypad is based on the configuration of older, mechanical calculators and adding machines. Even back when there was no such thing as a "calculator" there were mechanical devices that could add, subtract, multiply and divide. The layout of the keys in these machines were always with the smaller numbers on the bottom and the larger numbers on the top. The 100 key machines had a row of zeros across the bottom, a row of ones next in the line above and twos after that. They went on up to a row of nines at the top. You would punch in your number, using whatever keys were necessary. then depending on what you wanted to do, you would either punch in the next number or you would put in your operation.

The phone started out with a rotary dial with the one at the top of the dial and the beginning of the alphabet starting with the number two, counter clockwise on the dial. This meant you turned the dial clockwise when you used it. This is the more comfortable direction to turn a dial with your finger. When push button phones came out, they just naturally followed the small numbers at the top rule that was started with the rotary dial phones.

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15y ago
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12y ago

Calculator is more accurate than a phone calculator.

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Q: Why is the keypad of a calculator different from that of a telephone?
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