In this study, a paper folding activity task, which involved reaching the Pythagorean Theorem with a series of steps was designed. The aim of the task is to reach the Pythagorean Theorem with folding activities by deductive reasoning and logical inference. The study aimed to examine the effectiveness of the task and to share the patty paper folding task with the teachers. The activity was used with 20 ninth grade students studying in a public school. The patty paper folding activity task was carried out for a total of 6 lesson hours for three weeks. The students did not have difficulty while folding; they generally had difficulties in performing algebraic operations and expressing the concepts mathematically. The students participated in the activity willingly and the patty paper folding task helped students understand why the theorem is true and contributed to meaningful learning in terms of being a explanatory proof.