A 9 Key Calculator

A 9 Key Calculator

9 Key Calculator

:A calculator, also called a calculating machine, calculating device, arithmometer, or simply a calculator, is a calculating tool that performs arithmetic calculation functions, such as adding, subtracting, multiplying, dividing, finding the greatest and least values of numerical expressions, and finding the remainder of a division.



Accountants are 10-key whizzes and using these machines make their job much easier. Having a 10-key calculator that can print off the working figures you’ve been inputting can allow you to easily double-check work after all the inputting is complete. You can go through the printed figures to see if you’ve caught everything. Many users of the 10-key calculators will then affix the printed equations to the pertinent stack of receipts or invoices as proof of work. Even if you are your own boss, it can be great to put this kind of paper-trail oversight to work. Like typing and piano and any other manual dexterity task, it’s in practice that you’ll find perfection. Getting started with a 10-key adding machine may feel awkward and bump-in-the-night at first, but don’t look at the keypad. Look at your source material and try hard to type without checking finger positions. You’ll get the hang of it faster than you think, and your future accounting, bookkeeping, auditing and other numerical data work will be a breeze. See your total there on the screen now? I hope it shows —6 or 6.— depending how your calculator shows negative numbers. If it doesn't, start over at #1 above. The thing to remember here is that the calculator is going to ADD everything you input with the keys. So if you want to subract something, you have to enter it as a negative number or, if it's easier to remember, think of it as telling the machine you want to add into the total the number 6 you just entered, you want to add in the 5, take away or subtract the 9, and take away or subtract the 8. But you can't tell the machine to do these things with a number until you've entered the number itself!

For example, you are calculating expenses from a recent business trip and, separately, you want to divide a $180 dinner bill from 5 guests. Accounting for the expenses from that employee (let's assume they had a $500 allowance) could be entered like this: 500, depress + (plus symbol for credit entry), 100, depress - (minus symbol for debit entry), 180, depress ÷ (division symbol), 5, depress = (equal sign), which will result in 36, depress - (minus symbol for debit entry), then depress * (total symbol key). You are left with a positive balance of $364. Notice, the division of the $180 by 5 guests did not register as a positive or negative entry until we depressed the - (minus key).When describing how to use various calculator functions, this guide gives the exact keys that you need to press using the symbols shown on the keys. This is known as a ‘key sequence’. If the key sequence accesses the second function of a key, or a function from a menu, the name of this function will be given in brackets at the appropriate point in the key sequence. Names in brackets are thus not keys that you press but simply describe the function that is accessed using the previous key sequence. For example, to turn off the calculator, press (Source: www.open.edu)


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