Funny Math Proofs

We hope you enjoy our collection of funny math proofs, favorite math jokes and jokes about numbers. You may want to check out our algebra math jokes, calculus math jokes, geometry math jokes etc. on our Math Trivia page.

A collection of Funny (or Flawed) Math Proofs

Prove that 2 = 1

The following diagrams show the proof that 2 = 1. Scroll down the page for more examples of funny or flawed math proofs.

(The above proof is incorrect because we divided by (a - b) which is 0 since a = b) Proof that $1 = 1 cent

$1 = 100 cents
= (10 cents)²
= ($0.1)²
= $0.01
= 1c The above proof is incorrect because 100 cents = 10² cents ≠ (10 cents)²

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 = \(\sqrt {evil} \) 5. So, girls are evil:

girls = \({\left( {\sqrt {evil} } \right)^2}\) = evil
The above proof is incorrect because “Money is not the root of all evil”. It is “The love of money that is the root of all evil” and of course “girls are not evil” (Proof by Majority Rule).

A Proof that 0 = 1.

• Show Step-by-step Solutions

The above proof is incorrect because when we take the square root we must be careful to include both the positive and negative roots. There should then be two possible answers (one of which is to be rejected).

Ma and Pa Kettle prove that 25 divided by 5 is 14

• Show Step-by-step Solutions

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