Another famous irrational number is Euler’s number *e* named after the Swiss mathematician Leonhard Euler, often more simply referred to as the exponential number.

The number ** e **crops up in a wide range of mathematical topics from calculus through to compound interest!

We will now take a look at the picture of ** e**, to three decimal places.

*e *= 2.718

*e *= 2.718

We will now take a look at the picture of ** e**, to four decimal places.

*e *= 2.7183

*e *= 2.7183

We will now take a look at the picture of ** e**, to five decimal places.

*e ***= 2.71828**

*e *= 2.71828

Finally we will take a look at the picture of ** e**, to six decimal places.

*e ***= 2.718281**