Mathematics diary for the second volume of fourth grade, more than 400 words, 5 articles

During the summer vacation, my mother hired a decoration company to renovate the room. The floor in the living room was removed and replaced with floor tiles. While calculating the area, I asked happily: "Mom, I can already calculate." Let me help you calculate the area." I used a tape measure to measure the length of the living room to be 5 meters and the width to be 3.8 meters. Its area should be 5*3.8=19 square meters. I proudly told my mother that buying 19 square meters of floor tiles is enough. My mother smiled and asked me: "What I want to buy are square floor tiles with a side length of 6 decimeters. Can you tell me how many tiles are needed?" I was stunned for a while, and after a while, I thought: I will calculate it first. Mom needs the area of ??each floor tile, and then divides the area of ??the living room by its area to get the quantity, right? So, I first calculated the area of ??each square with a side length of 6 decimeters: 6*6=36 square decimeters=0.36 square meters; then I divided 19 square meters by 0.36 square meters, which is approximately equal to 52.78. Then the area in my mother’s living room You should buy 53 floor tiles which is enough. I proudly told my mother: "Mom, just buy 53 tablets." My mother praised me for applying the knowledge I learned to my life. But when I was paying the bill, I saw that my mother had bought 56 ??pieces. I asked my mother strangely: "Didn't I calculate 53 pieces? Why did you buy three more pieces?" My mother told me that it was because there was loss during the construction process. , if the size is not suitable when cutting, it will need to be re-cut, so when purchasing, it will be more than the actual quantity. She also told me that life is concrete, and you must think more when using mathematical methods effectively. The reality in life can make mathematics truly close to our lives.