Today, I finished my homework early in the morning. My mother saw it and came up to me and said, "Zini, play a game with you!" " ""good! " I readily agreed.

Mother brought a round cardboard and fixed a rotatable pointer in the center of the cardboard with a nail. The cardboard is divided into 24 grids on average, and the number 1-24 is written in each grid. "Mom, what are the rules of the game? Say it quickly! " I said impatiently.

"The rules of the game are simple, that is, when the pointer goes to an odd or even cell, the next number must be added. If it adds up to an odd number, I win; If the sum is even, you win. " Mom said with a smile.

I saw that the rules of the game were very simple. I played for more than a dozen times in a row, but I couldn't beat my mother every time. My mother smiled. "Why is it always singular?" I asked my mother puzzled. Mom 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 points to the odd number, then the next number must be even; If the pointer points to an even grid, then the next number added is odd, so no matter where the pointer points, the number added is odd. Mom won with this rule.

In the world of mathematics, there are many wonderful laws. As long as we learn math well and make good use of it, it is everywhere! Composition evaluation: summarize the full text at the end of the exercise, echo the beginning and deepen the theme. The exercises highlight the practicality of mathematics in life, and reveal the mathematical literacy that mathematics comes from life and returns to life, which meets the basic requirements of math diary.