FutureStarr

## 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.

### Key

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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