Today, my mother watched Lucky 52 on TV, and there was a question in it. Pupils didn't get the doctor's answer correctly. My mother asked me to do it. The topic is: a monkey carries corn, 12 bags a day and eats 7 bags at night. When can this monkey move 500 bags of corn? A: 99 days. Answer B 100 days. Answer C: 10 1 day.

I think: 12-7=5 (bags), that is to say, moving 5 bags every day, then 500÷5= 100 (days).

I'm snickering in my heart. Suddenly, I thought: On the last day, if I don't eat, there will be 500 bags. Then, 1 day should be reduced, so it takes 100- 1=99 days. I handed in my paper at my mother's place, and my mother said, "Congratulations, you got it right. Wow, I ...

go shopping

Today is the weekend. In the afternoon, my grandparents and I went shopping.

We walked into the Jeanswest store, and grandma chose three T-shirts made in 29 yuan and bought them. Grandma asked me, "How much is this * * *?" Without thinking, I said, "A * * 87 yuan (29×3 is about 90,90-3×1= 87 yuan)."

After grandma bought clothes, we walked out of the clothing store. Grandma said, "It's already half past five. Let's eat rice noodles. " Into the rice noodle shop, we bought a bowl of medium rice noodles, two bowls of small portions, a steamed dumpling and two bowls of porridge. Grandma asked me, "How much should I pay?" I said, "One * * 1 7 yuan, because the middle portion is 4.50 yuan, the small portion is 3.50 yuan, the steamed dumpling is 3.50 yuan, and the porridge1yuan (4.50+3.5× 3+/kloc-0 /× 2 =17 yuan).

After dinner, we went home.

Buy oranges

In life, mathematics is everywhere. For example: buy food! Buy stationery! Measuring cloth, etc. , all need to use mathematics.

This semester, the teacher taught a new knowledge, that is, the multiplication and division of decimals. This knowledge helps me a lot!

Last night, my mother went to buy oranges together. A kilo of oranges 1.8 yuan. My mother bought 4.5 kg and should pay 8. 1 yuan. But the clerk was careless and didn't know how to calculate it, so it became 9 yuan money. Fortunately, I used the knowledge of Protestantism this semester and calculated in my mind that 1.8/2 = 9 (angle) 1.8x4 = 7.2 (yuan) 9jiao +7.2 yuan = 8. 1 yuan, which immediately corrected the clerk's mistake.

Not only did my aunt, the shop assistant, praise me for my cleverness and my ability to multiply and divide decimals in such a small city, but my mother also praised me for saving her 0.9 yuan on the way home, and the knowledge I learned can be applied in my life.

Yes! If you don't learn this math well, you will lose not only 0.9 yuan, but also hundreds, thousands or even hundreds of millions.

When can the snail climb out of the well?

I saw a thinking question in a book today:

A snail is trapped in a well 15 meters deep. Snails climb 1 m every day and drop 30 cm at midnight. When can the snail climb out of the well?

I listed the formula on the draft paper: snail crawls 100-30 = 70cm every day, 10 day snail crawls 70× 10 = 700cm, 20 days snail crawls 70×20 = 1400cm, leaving/kloc-. It takes 20+ 1=2 1 day for a snail to climb out of the well.

It turns out that there is mathematics everywhere in life!

The weather will be fine on Sunday, September 9.

What is mathematics?

Today, I heard grandma tell a story.

This is the true story of the famous Polish mathematician Selma Pinski.

One day, when he moved, his wife took out his luggage and said to him, "I'll call a taxi, and you look after the luggage here, *** 10 box." After a while, his wife came back. He said to her, "Just now you said there were 10 boxes, but I counted only nine." "No, it must be 10." "What to say, I'll count it again, 0, 1, 2, 3. . . . . . "

Oh, I see. Mathematics is composed of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.

September 9(th), 2007

Angle understanding

In our life, we can touch things related to mathematics everywhere.

Take the horn as an example. As long as you look closely, you can find many things related to horns. For example, the clock we often see, at noon 12: 30, I found a flat angle on the clock face. If you use 10 minutes again, an obtuse angle will appear. If we wait another 5 minutes, that is, 12: 45, a right angle will appear. When the pointer is walking for 15 minutes, that is, 1, an acute angle will appear on the clock face.

I listened and read, and my heart was full of joy. I want to learn math well and apply what I have learned to my present life.

The story of decimal point

Although the head of the decimal point is small, I know that the decimal point is not small.

For example, 3.80 yuan, without a decimal point, doesn't it become 380 yuan? 3.80 yuan is too different from 380 yuan! Don't you see how big the decimal point is in this comparison?

Many students often miss it when writing, so this number is not what you originally wanted to write. So let's not make this big mistake again!

Eat some candy

Today, my mother bought some sugar. I can't wait to eat two fifths first. Then, I took a sip of water and went to do my homework. After finishing the Chinese preview homework and math exercise book, I ate another fifth. Then my mother said, "What sugar is so greedy?" I want some, too. In this way, we ate four-fifths of the sugar, and my mother asked me, "How much sugar is left?" I replied, "Only one fifth of the sugar! "On this day, I expressed the sugar we ate with mathematical knowledge. I am really happy now.