Among the necessary mathematical knowledge and skills in daily life, natural numbers, their properties and the relationships between these numbers, the operations performed with these numbers, the properties of the operations mentally skills have an important place. Considering that mathematics education starts with counting and that I have numbers at every stage of mathematics education, exploration studies and projects can be made in this way for students in mathematics education. Transferring number relationships to real situations is the basis for starting to make sense of the world in a mathematical way. The world of mathematics offers a wide variety of number types, all of which have their own characteristics. Mathematicians formulate theories about the relationships between numbers and number groups. The most well-known special numbers among numbers are as follows,

- If there is a more interesting number than Pi, it is two Pi. In other words, it is twice the Pi. This number, known as the Tau number, has a value of approximately 6.28. While pi relates the circumference of a circle to its diameter, tau relates the circumference of a circle to its radius, and many mathematicians argue that this relationship is much more important.