I remember before, I thought 100 million was a big number, but I didn't know how big it was.
Let's just count the exercise books. How long will it take us to count 100 exercise books? 1 serving, 2 serving, 3 serving ... 100 serving, which takes about 1 10 second. There are 1000 exercise books, 10000 exercise books, 100000 exercise books ...1000000 exercise books? Just do the math and you'll know how big 100 million is.
Calculate, hundreds of millions of exercise books will take about 1 100000000 seconds. Imagine, how many points do you need for hundreds of millions of exercise books? How long? How many days? How many years/about 183333 minutes, 30556 hours, 1273 days, 3 years! I really don't know, hundreds of millions of homework would have taken three years!
This shows that 100 million is really big!
Math diary 200 words 2: math diary (58 1 word).
It's sunny on Sunday, September 16.
The number χ is very special. It looks like an "X".
One day, several digital friends such as "1", "2", "3" and "4" got together to compare the sizes.
Suddenly "χ" appeared in front of them and said, "Stop competing! You are no match for me! " 1 said, "How can you compare with us? You don't even know what you are, and you dare to come here and compete with us. Hey, what a young man! "
Not convinced, χ jumped in front of χ 1 and said loudly, χ- 1=9, χ=9+ 1, χ= 10. Look, I am older than 9! "
As soon as it heard "0" in the cave, it rolled out, pulled the number "1" and ran to "χ" and said, "χ× 1=0, χ=0, χ = 0, smaller than anyone else. In the fourth grade, math diary's second volume has 200 words and 5 articles. "
After hearing "0", "χ" is no longer proud.
Math diary 200 words 3: math diary (26 1 word).
September 2 1 Sunday sunny
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 apples together. A kilo of apples is from 2.6 yuan, and my mother bought 4.5 kilos. I should pay 9 yuan. But the clerk is careless and doesn't know how to calculate. Yes 12.2 yuan. Fortunately, this semester, I used the knowledge of Protestantism, and after doing a calculation in my mind, I immediately corrected the salesman'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 0.5 yuan on the way home, and the knowledge I learned can be applied in my life. Math diary, Grade Four, Volume II, 200 words, 5 articles. Yes! If you don't learn this math well, it's not only 0.5 yuan that will lose, but also hundreds, thousands or even hundreds of millions!
Math diary, Grade Four, 200 words: math diary, Grade Four (278 words)
It will be sunny on Sunday, September 25th.
Today, I counted the number of pages and words in the book Free Travel in Thailand. I think it is difficult to count the number of words in this book, because every page of this book has at least one picture, and some are full pages of pictures. I browsed the whole book, and it is estimated that there are 500 words on an average page. I randomly counted 10 pages, then estimated the thickness of 50 pages according to the thickness of 10 pages, and then estimated the thickness of the whole book to be more than 3 pages, which should be more than 150 pages or even more than 20 pages. Then, the total number of pages in this book should be 50 * * * 3+20 = 6544. I estimated the number of pages and words. I turned to the last page, and sure enough, this book is 160, and my calculation is more accurate.
Math diary 200 words five: math diary (245 words).
It will be sunny on Sunday, September 29th.
Life is inseparable from electricity, and our family has to pay the electricity bill every month. According to my mother, the electricity consumption per kilowatt hour is 0.69 yuan, and our family consumes about 6 kilowatt hours every day, so 0.69×6=4. 14 yuan, and our family consumes 4. 14 yuan every day. Returning home during the Spring Festival 1 1 day, the electricity saved is:11× 0.69× 4.14 = 31.41yuan. Math diary, Grade Four, Volume II, 200 words, 5 articles. Wow! Go home 1 1 day and save 3 1.42 yuan electricity bill. Our monthly electricity bill is 4.4 1×30= 124.2 yuan. The annual fee is124.2×12 =1490.4 yuan. Wow! Our electricity bill is more than 1000 yuan a year, so we have to save electricity.