Today is Monday. I am at home alone. It was already half past eight when I woke up. I jumped out of bed at once. At this moment, my mother called me and told me something. It took me five minutes to answer this call. I quickly changed my clothes, brushed my teeth and washed my face. Then I went straight to the table for breakfast. It took me another fifteen minutes, 15+5=20 (minutes). 8: 30+20 = 8: 50 (minutes) 12: 00-8: 50 = 3: 50 (minutes), and it will be noon in three hours and fifty minutes. It was exactly 9 o'clock when I walked back to my small room. I took out my exercise book and began to do my homework. I spent an hour doing my homework, at nine o'clock.
Mathematics in Life (2)
Today is Monday. My sister goes out to work and eats outside. My parents eat outside, so I eat at home. I cook and go shopping in the mall. When I arrived at the shopping mall, I saw two kinds of noodles for me to choose from. One was 450g, and the other was 400g, which was 2/3 of the price of the first kind of noodles. I ate at home alone, and a little bit was enough, so I chose the second kind of noodles, saving my parents' hard-earned money and killing two birds with one stone. It suddenly occurred to me that my mother asked me to buy five badminton, each 2 yuan, 5×2= 10 (yuan), 10+3= 13 (yuan).
Mathematics in Life (3)
I have finished my meal, and it suddenly occurred to me that I haven't washed my clothes yet. I hurried to wash it, but as soon as my hand reached into the water, I felt so cold that I couldn't help washing it. You have to wash 10 clothes at a time, and one in five minutes. 10×5 = 50 minutes, but it takes 50 minutes. Time will be halved, 50×50%=25 minutes. Finally, I have to hang clothes. I have to air each piece of clothes for 30 seconds, and I have to air 10 pieces. Let me see how many minutes it will take.
10×30÷60
=300÷60
=5 minutes
It takes five minutes. That was close. Mom and dad have not come back yet. What a happy day!
Dad's troubles
A month has arrived, and you can get pocket money again. I asked my father to take the money. Father gives me 100 yuan more every month. I was very happy, so I went out. Go to the toilet at night and hear mom and dad talking. I heard my father say to my mother, "We don't have enough living expenses every day. Your brother borrowed 2000 just now, and our salary is only 3000. " I think I have 200 yuan and my sister has 2 12 yuan.
2 12+200+ 1000
=4 12+ 1000
= 14 12 (yuan)
14 12 yuan is enough. My sister and I gave it to my father. My father smiled at once, and my father was no longer worried.
The mystery of numbers
Today, I ate at home alone again. When I came back from shopping, I saw a pair of learned young people meet for the first time. The man asked, "What is a young lady's youth?" The woman replied, "Divided by 4 is greater than 3, divided by 6 is greater than 5, and divided by 8 is greater than 7." The man said, "What a coincidence, you multiply 10, and I subtract 7, which is just 2 10." They're gone.
I've been thinking all night, and I don't know how old they are. I did the experiment with 1 and got 23. Finally, we get that 23 divided by 4 is greater than 3, 6 by 5 and 8 by 7. Then, I look for the meaning of men.
23× 10-2 10+7
=230-2 10+7
=20+7
=27 years old
There are too many mysteries in mathematics!