en.wikipedia.org/wiki/Calculator

An electronic calculator is a small, portable electronic device used to perform
operations ranging from basic arithmetic to complex mathematics. The first solid ...

web2.0calc.com/

Free online scientific notation calculator. Functions include math expressions,
plots, unit converter, equation solver, complex numbers and calculation history.

itunes.apple.com/us/app/the-calculator-free/id398129933?mt=8

Jan 16, 2017 ... THE #1 CALCULATOR ON APP STORES WORLDWIDE * The Calculator Free
combines the Standard and Scientific calculator for Free!

www.online-calculator.com/

A Free Online Calculator, Quick and Easy, and Full Screen!

www.calculator.net/

Online scientific calculator, mobile apps, and a rich collection of free online
calculators, including mortgage, loan, BMI, ideal weight, body fat calculators and
...

play.google.com/store/apps/details?id=com.google.android.calculator&hl=en

Calculator provides simple and advanced mathematical functions in a beautifully
designed app. • Perform basic calculations such as addition, subtraction, ...

calculator-1.com/

Use simple and easy free online calculator at work, at school or at home. With our
calculator you can perform simple and trigonometric calculations.

www.calculatoria.com/

Online mathematical calculator with basic and scientific modes. Shows
calculation history.

www.math.com/students/calculators/source/basic.htm

Free math lessons and math homework help from basic math to algebra,
geometry and beyond. Students, teachers, parents, and everyone can find
solutions to ...