Easy mnemonic to memorize first 8 decimals of Euler's number

Here is a great way to easily memorize the first 7 decimals of e, the famous mathematical constant. For the non-mathematicians, the value of e is about 2.718281828.

The mnemonic makes use of  the mnemonic count system: you can the number of letters in every word of a sentence to make a mapping between a long series of digits and an (far easier to remember) sentence.

Now let's look at this key phrase:

Charles I Insulted by Cromwell's Soldiers

This is a well-known oil painting by Hippolyte Delaroche where the victorious soldiers of Oliver Cromwell were insulting Charles I of England after the Second English Civil War. Charles is in the middle of the painting below.

Count the letters in every word and you will find the first 7 decimals of e:

• Charles --> 7
• I --> 1
• Insulted --> 8
• by --> 2
• Cromwell --> 8
• s --> 1
• Soldiers --> 8