1. Excellent Diary of Mathematics in Grade Three of Primary School, 350 words.
On weekends, my mother took me out shopping. We first went to the supermarket and bought some things we needed at home. We have to buy salt, vinegar, yellow wine and slippers. When buying slippers, there are two kinds of slippers. The price of the first slipper is 15 yuan, and the price of the second slipper is 24 yuan, but it says "50% off" next to the price. I thought: 24-5= 19 yuan, but 19 is bigger than 15, so the first slipper is cheaper. At this time, however, my mother went to get the second kind of slippers. I quickly said to my mother, "Mom, 24-5= 19 yuan. The price of the second kind of slippers is 24 yuan. Minus five yuan, there is 19 yuan, but 19 is still larger than 15. Why do you want to get a second kind of slippers? " "Because the 50% discount here is half that of 24 yuan," my mother told me carefully. "So as long as the total price is divided by half, the formula is 24÷2= 12 yuan. Now 15 is bigger than 12, so the second kind of slippers is cheaper. " Now I finally understand.
Just as we were about to check out, we suddenly remembered to buy toothpaste, so we ran to the daily necessities section and found the location of toothpaste. My mother took a fancy to a toothpaste. After reading it, let me work out the price between the ordinary price and the membership price of this toothpaste. I thought about it for a long time, but I didn't come up with it. As a result, my mother said, "I forgot subtraction in the second grade." I have to review when I go home! " I smiled shyly.
There is mathematics everywhere in life!
2. The excellent diary of mathematics in the third grade of primary school is 350 words.
My cousin and I are playing on the playground. We found a square waste paper board with an area of about one square meter near the playground. Cousin looked at it and said, "Xiao Jing, if you divide this board into small squares with an area of one square millimeter, and then connect these small squares one by one into a straight line, how long will this straight line be?" "I blurted out without thinking:" How long can this last? Four meters at most! " Cousin smiled and said, "Don't jump to conclusions yet, let's work it out together." I began to think about it: 1 square meter equals 100 square decimeter ... 1000000 square millimeter, and the side length of the square is 1000000 millimeter. Isn't that 1000000 millimeter? Wow! This straight line, which consists of some small squares of one square millimeter, is as long as 100 meter.
I understand that learning mathematics can't be easily concluded just by looking at the topic. You have to think carefully and calculate carefully before you can do it right and explore the mystery.
3. The excellent diary of mathematics in the third grade of primary school is 350 words.
I'm going to learn to dance tonight, because I don't have any water. So, we are going to the supermarket to buy a bottle of mineral water. Mom usually buys it, so I don't even know how much a bottle of water costs. Mom gave me one yuan, but! Aunt salesgirl said it wasn't enough. A bottle of mineral water costs 4 yuan money. Wow! It is four times more expensive than I expected.
I ran out to ask my mother for money again. My mother gave me ten yuan this time, and I gave it to my assistant aunt.
I calculated it myself, 10 yuan -4 yuan =6 yuan, and the aunt of the salesgirl should call me 6 yuan. My calculation is very accurate. My aunt, the shop assistant, gave me 6 yuan money.
I gave the rest of the money to my mother, and she praised me for being great!
4. The excellent diary of mathematics in the third grade of primary school is 350 words.
On Sunday, my mother and I came to my grandmother's house. As soon as I entered the door, I found grandma holding a spring scale in her hand, as if to weigh something. Curious, I immediately ran over, grabbed the spring scale and said loudly, "Grandma, let me help you weigh it!" " "
"no! You won't! " Grandma said incredulously.
"Don't worry, Grandma, I learned kilograms and grams!" As I spoke, I hooked a bag of vegetables and proudly said, "It's weighed, 1 gram!" Grandma smiled and said, "Who will eat 1 g food?" It turns out that I used kilograms as grams again. How careless!
I ran to my mother and asked her to weigh me. My mother smiled and squatted on the ground. It was a long time before she recovered her breath and said, "You weigh 25 kilograms. This spring can only weigh 4 kilograms at most. How can I call you? " She turned my face red and white.
Students, mathematics is used in many places in life. If you don't learn well, you will make jokes like me.
5. The excellent diary of mathematics in the third grade of primary school is 350 words.
Today, I watched my Intelligent Mathematics happily at home. I looked at it and saw an interesting math problem about math on a pair of Spring Festival couplets. The content inside is that the elders of the Yuling tribe lived in the late Han Dynasty, and the Queen of the Magic Kingdom led the courtiers to celebrate their birthdays. When she arrived, the witch Xiaoxing saw the elder's long white beard and couldn't help asking, "How old is the elder? It's naughty to chew the head of an animal elf. He had already heard about the mathematical ability of the subjects in magic kingdom. He decided to have a look today.
So, he wrote a question in the context of couplets:
Part I: Flowers reopen, plus 37 years.
Bottom line: ancient and rare, once more in spring and autumn.
I didn't know where to start at first, because I didn't know the meaning of flower armor and ancient rarity. Later, my mother said, "Hua Jia means' 60' and Gu Xi means' 70'. Now, I finally have a clue. The reopening of the first part is two 60s in the next part, 3×7=2 1 year, 60×2+3×7= 14 1 year in the first part, and two 70s in the second part.
Ah! Mathematics is so interesting.
6. The excellent diary of mathematics in the third grade of primary school is 350 words.
On Saturday afternoon, when I finished my homework and had nothing to do, my mother gave me a question: "Do you know the characteristics of multiples of 2?" As soon as I heard it, I immediately replied: they are all even numbers. "What are their characteristics?" Mom asked again. "Their units are all 0, 2, 4, 6, 8." Mom said, "You are really something. Then do you know the multiple of 4 and know the characteristics? " Now you have me stumped. So, I found some multiples of 4 and found that their units are also 0, 2, 4, 6, 8, so I told my mother this rule. But my mother casually said a number, and I found it. Mom told me to keep watching, but I couldn't find it left or right. Mom reminded me: Look at the last two digits of these figures. I observed these figures according to the tips my mother gave me, and suddenly it dawned on me.
The original multiple of 4 is characterized by the fact that the last two digits of a number are multiples of 4, and this number is multiples of 4. Then, I found some numbers to try, such as: 437,37 divided by 4 = 9... 1. According to the law, 437 is not a multiple of 4. Then I divide 437 by 4 = 109... 1, which is consistent with this feature. I found another number, 1024, 24 divided by 4=6. I found that 1024 is a multiple of 4. I verified it again by division: 1024 divided by 4=256, so 1024 is a multiple of 4. I happily told my mother about this discovery, and my mother nodded with satisfaction.
I found this. Students might as well give it a try.