Can you Prove 1 = 2? – A Classic Mathematical Fallacy

In this post we will look at a mathematical fallacy that enables us to you prove 1 = 2? We will in fact prove that 1 = 2 using a series of steps, one of which has a flaw. Your task is to identify the step that contains the flaw. Check the video below for the steps that prove 1 = 2. This example by the way is one of the best examples of mathematical fallacies.


  • Joseph Malone

    In step 4 you subtracted from the right side but not the left.

74 − = 66