Mnemonics for e (idea)

or

What I Really Learned in College Calculus

The only downside to this mnemonic is that it actually requires you to remember the first two digits of the mathematical constant e (the number where de^x/dx = x). However, once you have those first two numbers down, you will instantly have access to more decimal places than are really worth working with by hand.

"2.7 Andrew Jackson squared, isosceles right triangle"

Now then:

1. 2.7 is the beginning of e.
2. Andrew Jackson was elected President in 1828.
3. It was the 2nd time he ran.
4. The angle measurements of an isosceles right triangle are 45-90-45.

So it is perfectly obvious that it yields:

e = 2.7 1828 1828 45 90 45