On Sunday, I finished my homework early in the morning. When my mother saw it, she came over and said, Let's play a game with you! ""good! " I readily agreed.

Mother brought a round cardboard, and a rotatable pointer was fixed in the center of the cardboard with a nail. The cardboard is divided into 24 grids on average, and the numbers of 1-24 are written in each grid. "Mom, what are the rules of the game? Say it quickly! " I said impatiently. "The rules of the game are very simple, that is, when the pointer turns to the odd or even cell, the next number must be added. If it adds up to an odd number, I win; if it adds up to an even number, you win. " Mom said with a smile.

I saw that the rules of the game were so simple, so I played for more than ten times in a row, but I couldn't beat my mother every time. My mother laughed. "Why is it always singular?" I asked my mother puzzled. Mother said, "Think for yourself!" So, I racked my brains to think, and finally reminded me of the formula that the teacher once said: odd+even = odd. Now I can see that if the pointer goes to the singular case, then adding the next number must be an even number; If the pointer goes to the even number grid, then the next number added is odd, so no matter where the pointer goes, the added number is odd. Mom used this rule to win.

In the world of mathematics, there are many wonderful laws. As long as we learn and use mathematics well, they are everywhere!