Basic online calculator to quickly and easily perform the most common mathematical operations such as multiplication, division, addition, subtraction of any numbers. You can use the free online calculator directly by clicking or tapping its keys or you can also use your computer keyboard.

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## Information and tips for using the online calculator

### 1. What is the Online Basic Calculator good for?

Essentially for performing simple arithmetic operations (just like with a classic calculator). This is a basic calculator so you can perform the following operations: multiplication, division, addition, subtraction.

### 2. How do I use the Online Basic Calculator?

Click on numbers and functions in Calculator just as you would with a standard or classic calculator. When you click the add, subtract, multiply, or divide button, you will see a white ring flash around the button to let you know the operation to be carried out. This calculator uses an algebraic method of entry that allows you to enter mathematical sequences in the same order that they are algebraically stated. This also means that no need to close brackets if the equation sign follows anyhow. There is full keyboard support for each button on the calculator.

### 3. What are the ‘extra’ buttons mean?

[C] Click to clear the number displayed by the Online Basic Calculator. Removes an incorrect entry/number from the display when pressed before any function or operation key is pressed. You can also use the DEL button on your keyboard.

[mc] It clears the memory of the calculator.

[m+] Click to add the displayed number to the number in calculator memory. If no number is in memory, click to store the displayed number in memory.

[m-] Click to subtract the displayed number from the number in the calculator memory. If no number is in memory, click to store the displayed number as subtraction of zero in memory.

[mr] Click to replace the displayed number with the number in memory.

If the button has a white ring around it, there is a number stored in memory. The white ring around the button also disappears if the stored number calculates zero.

[+/-] Simply just changes the algebraic sign.

### 4. How precise the Basic Online Calculator?

The Basic Online Calculator operates with a precision of 15 digits after the decimal point. This is due to an issue with how JavaScript handles floating-point numbers. This is all about how IEEE defines floating-point numbers which are stored in memory. Any language using this definition suffers from this undesired feature. Besides this Most ‘real’ calculators as the TI-30X or the HP 12c have a ‘displayed’ precision of <= 10 digits (internal it’s higher though) which relativizes this problem here anyhow.