During the summer vacation, my mother found a decoration company to redecorate the room. The floor of the living room was demolished and replaced with floor tiles. When calculating the area, I asked cheerfully, "Mom, I already know the area. Let me help you calculate it." 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 smiled and asked me, "I want to buy a square floor tile with a side length of 6 meters." Can you tell my mother how many pieces I need? " 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 calculated 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." My mother boasted that I knew I had applied what I had learned to my life. But when I paid the bill, I saw that my mother bought 56 tablets. I asked my mother strangely, "didn't you count 53 tablets?" Why buy three more tablets? "My mother told me that because of the loss in the construction process, if the size is not appropriate when it is accidentally cut, it needs to be cut again, so I have to buy more than the actual quantity. She also told me that life is concrete, and when using mathematics effectively, we must think more about the reality in life in order to make mathematics really close to our life.