Calculator
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A calculator is a machine which allows people to do math operations more easily. For example, most calculators will add, subtract, multiply, and divide. Some also do square roots, and more complex calculators can help with calculus and draw function graphs. Smartphones and computers usually have a calculator app.
Some calculators, like the abacus, will work without electricity. Others, like the electronic calculator, use batteries. A printing calculator can print its results on paper.
Pocket calculator
A pocket calculator is a small calculator that helps people do arithmetic. It is so small that it can be put in a pocket. Its most common use is for addition, subtraction, multiplication, and division. Many pocket calculators are powered by solar cells. They are commonly seen in schools and businesses and can be used quickly and efficiently for simple mathematical problems. Other names are 'miniature calculator' or 'mini calculator'.
Scientific calculator
A scientific calculator can do more things. It can often use exponents (or powers or indices), pi, trigonometric ratios, and the order of operations. Scientific calculators can also use bigger numbers. They tend to cost more than pocket calculators. Many are also programmable. The user can make a program directly with the calculator, or transfer one from a computer.
Calculator Media
An electronic pocket calculator with a seven-segment liquid-crystal display (LCD) that can perform arithmetic operations
A modern scientific calculator with a dot-matrix display
Scientific calculator displays of fractions and decimal equivalents
The interior of a Casio FX-991s calculator
An office calculating machine with a paper printer
17th century mechanical calculators
The Grant mechanical calculating machine, 1877
Patent image of the Clarke graph-based calculator, 1921
Early calculator light-emitting diode (LED) display from the 1970s (USSR)
The Bulgarian ELKA 22 from 1967
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