I've had this calendar photo above my computer for some time. It's an old-fashioned adding machine. This one has 72 number keys, an entry handle and a paper tape and is like one I was trained to use long ago. It's very different from a 10-key adding machine, which is mimicked on many computer keyboards.
Individual digits, no matter how large or small the entire number, are entered beginning from the lowest value to the highest (1 to 9). Any value not specifically entered is assumed to be zero. As you go up the array of keys, your hand gets closer to the handle. After entering the highest digit, you pull the handle down and that number is entered.
Here's how to enter 391,706.48. You can ignore the zero in the tens column as it will default to zero when the handle is pulled. Using only the fingers of the right hand, press the 1 key in the column corresponding to the thousands (1,000's) position followed by the 3 in the far left (100,000's) column. Continue pressing keys in the appropriate columns in this order: the 4, the 6 (there are no 5's), then the 7, next the 8 and finally the 9 before pulling the handle downward, leaving your hand in position for the next group of numbers.
Difficult as it may be to believe, you can get used to this and become very efficient in entering numbers.
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