All in One Free Online Calculator
This is a simple basic calculator with memory functions similar to a small handheld calculator. Use this basic calculator for math with addition, subtraction, division and multiplication.
Large, easy and convenient online calculator
Use for work, school or personal calculations. You can make not only simple math calculations and calculation of interest on the loan and bank lending rates, the calculation of the cost of works and utilities.
Commands for the online calculator you can enter not only the mouse, but with a digital computer keyboard. Detailed instructions for using the calculator, see below.
Instructions for using the online calculator
Keys function
[ 0 ], [ 1 ], [ 2 ], … [ 9 ] – standard number keys;
[ + ] – addition, [ – ] – subtraction, [ х ] – multiplication, [ / ] – division;
[ AC ] – reset the calculator and reset the memory.
Frequently asked questions about the calculator
Why do we get 8 when trying to calculate 2+2×2 with a calculator?
Calculator performs mathematical operations in accordance with the order they are entered. You can see the current math calculations in a smaller display that is below the main display of the calculator.
Calculations order for this given example is the following: 2+2=4, subtotal – 4. Then 4×2=8, the answer is 8.
The History of calculators
The ancestor of the modern calculator is Abacus, which means “board” in Latin. Abacus was a grooved board with movable counting labels (stones or bones).
Presumably, the first Abacus appeared in ancient Babylon about 3 thousand years BC. In Ancient Greece, abacus appeared in the 5th century BC.