Funny Math Proofs

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A collection of Funny Math Proofs.

A Mathematical Proof that "Girls are Evil"

1. “Girls require time and money”;

girls = time × money

2. “Time is money”:

time = money

3. So girls are money squared:

girls = money²

4. ”Money is the root of all evil”:

money =

5. So, girls are evil:

If a = b (so I say)                                        [a = b]
And we multiply both sides by a
Then we'll see that a²                                  [a² = ab]
When with ab compared
Are the same. Remove b². OK?                 [a²− b² = ab − b²]

Both sides we will factorize. See?
Now each side contains a − b. [(a+b)(a − b) = b(a − b)]
We'll divide through by a
Minus b and olé
a + b = b. Oh whoopee! [a + b = b]

But since I said a = b
b + b = b you'll agree? [b + b = b]
So if b = 1
Then this sum I have done [1 + 1 = 1]
Proves that 2 = 1. Q.E.D.

Written by PeterW

(Just in case you're wondering - the above proof is incorrect because in step 5, we divided by (a - b) which is 0 since a = b)

Abbott & Costello prove that 7 times 13 = 28

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