In the morning, I groped in the closet and finally put on a pink and white sock. Mom said: We put a pair of pink ones, a pair of white ones and a pair of blue ones. Think for yourself, how to save time and effort? I feel my head is big, but I can't think of anything. Mother spoke: don't stay there, think again. A flash of light flashed through my mind. I made a double calculation and proudly replied loudly: Touch it four times! From the worst point of view, the first three times are different, and the fourth time there will be color repetition! Mom said humorously, hey, my little idiot is so smart! However, lucky people will catch fewer times, right?
In the afternoon, my father put a bottle in the toilet pumping tank, and then came up to me and said, dear, my father put a bottle in the pumping tank, which can save 100 ml of water every time he flushes the toilet. Suppose one person washes three times a day, how many milliliters of water will the three of us save a day? I listed the following formula: 10033 = 900 ml. Dad looked at it and said, great! So there are about150,000 people in a town. How many milliliters of water can we save every day? How many liters of water? After a little thought, I wrote: 150000 = 150000, 1500000300 = 45000000 (ml), 45000000 ml = 45000 (liter). Dad nodded and asked: The urban population of our country is about 4. 500 million people, how many liters of water are saved every day? How many tons? I thought for a while, and then I wrote: 4. 500 million = 450 million, 45,00015 = 3,000, 300,045,000 =135,000,000 (liters) =135,000 (tons). I can't see that a small beverage bottle can save so much water in a day. How much water did you save that year? I wrote: 135000 365 = 49275000 (ton). Dad smiled with relief: my baby daughter is not bad! Great, you can go to the movies today. Yeah! Long live dad! I cheered. Of course, I am not only happy to watch the movie again, but also my conversion and column calculation level have improved.
It turns out that mathematics is everywhere in life. Let's pay attention to it together!