FutureStarr

A Need to Use a Calculator

# Need to Use a Calculator

If you need to use a calculator, this is the place to go. And while you may not be in the market for a calculator, there are a lot of handy apps out there that can have you back on your way in no time. This article explains 10 apps with calculators. And if you are looking for more apps, be sure to also check out these other helpful articles on spell check, calculator, and app finder.

### Use

Most calculators these days require electricity to operate. Portable, battery-powered calculators are popular with engineers and engineering students. Before 1970, a more primitive form of calculator, the slide rule , was commonly used. It consisted of a slat of wood, called the slide, that could be moved in and out of a reinforced pair of slats. Both the slide and the outer pair of slats had calibrated numerical scales. A movable, transparent sleeve called the cursor was used to align numerals on the scales. The slide rule did not require any source of power, but its precision was limited, and it was necessary to climb a learning curve to become proficient with it.

You will also notice some differences in how addition, subtraction, multiplication, and division keys appear. Once you bring up the calculator function, there is often a circle or square to give you the operations which you perform using the Menu button on the phone. Always put a number in to start and then you can add, subtract, multiply, or divide. A few phones have other operations available, but usually they are available as a download and are quite expensive compared to purchasing a calculator. (Source: www.universalclass.com)

### Number

The calculator is a tool to do calculations just as the human mind and paper and pencil are tools. There are many times when mental computing (or even paper & pencil) are more effective or appropriate. For example, adding single digits is done much more quickly using mental math (in your mind) than by punching every number and operation into the calculator. Choosing the right 'tool' is part of effective problem-solving process.

You could write down the answer to the first part of the calculation on paper, and enter it into the calculator again. However, it is possible that you may make an error either in writing down the number or in typing it into the calculator. A better method is to use the fact that the calculator retains the last calculated answer, which can then be inserted in the subsequent calculation using the (Source: www.open.edu)

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