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For use with a shorter keyboard or laptop which omits the numberpad Bluetooth numeric keypad, working also as calculator. A numeric keypad, number pad, numpad, or ten key, [1] [2] [3] is the palm-sized, usually-17-key section of a standard computer keyboard, usually on the far right. It provides calculator-style efficiency for entering numbers.
By definition, we know that: = =, where and .. Setting =, we can see that: = = = =.So, substituting these values into the formula, we see that: = =, which gets us the first property.