Mathematics is everywhere in our life. We can record the mathematics in our lives through diaries. The content can include interesting things that happened in our math learning class, problems that happened in the process of doing problems, math stories that happened in the process of discussing with classmates, as well as math problems and math stories in daily life, such as supermarkets and vegetable markets. Math diary kept a diary. Simply put, it is a diary related to mathematics.

Let me give you an example:

I once saw a deceptive trick in front of a supermarket.

There is a wooden disc. The pointer is fixed in the center of the disc with a nail. The disc can be rotated and divided into 24 equal cells, in which 1-24 equal numbers are written respectively. There is nothing valuable in the odd unit, but almost all even numbers are valuable.

The gameplay is also very simple. First set the pointer to 1, then you turn the disc, and the disc starts to rotate and finally stops. Then press the number marked on the grid where the pointer is located, and then dial the pointer to N- 1 grid (n is the number marked on the grid). In which box the pointer finally stops, the number in Gerry is yours.

I thought about it and found it impossible to get anything of value. Because when the pointer turns to an odd cell, the number of cells dialed is odd-1= even, and odd+even is only equal to odd, so it is impossible to turn to an even cell and nothing valuable can be obtained. If the pointer turns to an even grid and the number of grids dialed is even-1= odd, and odd+even = odd, then you won't get anything of value.

From this incident, I can see that some cheating methods adopted by some businesses must have been discovered by mathematics. So learning mathematics is very helpful to life, and mathematics is also needed in life.