Fan Wenyi:

During the summer vacation, my mother asked the decoration company to redecorate the room. The extra floor was removed and replaced with floor tiles. When calculating the area, I said, mom, I can already calculate the area. Let me help you calculate. I measured it with a tape measure, and the length and width of the living room are 5 meters and 3.8 meters respectively. Its area should be 5*3.8= 19 m2. I proudly told my mother that it was enough to buy 19 square meters of floor tiles. My mother asked me with a smile: I want to buy a square floor tile with a side length of 6 meters. Can you tell me how many pieces my mother needs?

I suddenly paused and calmed down for a while. I think: I'll work out the area of each floor tile my mother needs first, and then divide the living room area by its area, and then I can get the quantity. So, I first calculate the square area with a side length of 6 decimeters: 6*6=36 square decimeters =0.36 square meters; I divide 19 square meter by 0.36 square meter, which is about 52.78. Then 53 tiles in mom's living room should be enough. I proudly said to my mother, "Mom, just buy 53 tablets."

Fan Wener:

Today, I finished my homework early in the morning. When my mother saw it, she came over and told me to play a game with you! All right! 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 squares on average, and the numbers 1 to 24 are written in the squares respectively. Mom, what are the rules of the game? Say it! I said impatiently. The rules of the game are simple, that is, when the pointer turns to an odd or even cell, the next number must be added.

If it adds up to an odd number, I win; If the total is even, you win. Mom said with a smile. I saw that the rules of the game were so simple, so I played for more than a dozen times in a row, but I couldn't beat my mother every time. My mother smiled.

Fan Wensan:

It is a wonderful math class, an unforgettable class and a knowledge summary class. Today we learn circle. Do you know how to draw a circle without compasses? As soon as this sentence was spoken, the originally lively classroom was immediately silent. After a while, some students began to raise their hands. The teacher can draw with the bottom of the cup, and the teacher can draw with the speaker. Teachers can draw a circle with their arms.

The teacher can also hold his thumb and turn his other fingers, and everyone will start chattering again. The teacher recorded all these methods. Is there any other way? The teacher asked, none of this can change the size of the circle. Teacher, I know. A classmate raised his hand excitedly. Tie the pen with shoelaces, fix the other end and draw a circle with a straight line.