Calculator
From Simple English Wikipedia, the free encyclopedia
A calculator is a machine which allows people to do math operations more easily. For example, a normal calculator will add, subtract, multiply, and divide. Some also do square roots, and more complex calculators can help with calculus and draw function graphs.
Some calculators, like the abacus will work without batteries, others, like the electronic calculator won't.
For example, after pressing "3" and then "+" and then "2" and then "=" (or "ENTER") the number "5" will be displayed on the screen.
