There are many brands of calculator and different performance. Before choose a calculator you should have the idea about a good calculator.

• What function you need in your calculator. Calculators start with the very basic addition/subtraction/multiplication/division combo, and go all the way to high-end 3D graphing calculators capable of solving complex engineering equations, but they fall into three standard groups: basic, scientific, and graphing. Choose one of these.

• If you need a basic calculator, there's not much of an additional decision to make, as basic calculators are, well--basic. Scientific calculators, however, give you a few more decisions to make. Some include the ability to do not only basic trigonometry, but also many calculus functions.

• You can go to the website for more information and feature.

• If you need other then basic calculator. Graphing calculators take up a lot more space than scientific or basic, but most graphing calculators can still fit in you pocket. If you'll be near your computer when you use your calculator, consider downloading one for free. Search the internet for free basic, scientific, and graphing calculators.

• There is some way to buy. If you buy online, you'll probably get a much cheaper price than in-store. Unlike other products like clothes, there's little worry that you won't end up liking the product, as you can view all the details and images of the product online.

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