Other Free Encyclopedias » 21st Century Webster's Family Encyclopedia » 21st Century Webster's Family Encyclopedia - Buffalo grass to Cannizzaro, Stanislao


keys calculators

Calculator, mechanical or electronic machine for performing numerical calculations. Calculators have number keys (0 through 9) and additional keys for computing mathematical equations or functions, which are then displayed on a small screen. Calculators, first made available in the early 1960s, were miniaturized and marketed for consumers during the 1970s.

Calculus [next] [back] Calcium carbonate

User Comments

Your email address will be altered so spam harvesting bots can't read it easily.
Hide my email completely instead?

Cancel or