Math diary 1, a primary school, had a math lesson with relish today-moving the decimal point to the right.
Although the decimal point is called "small", it is extremely difficult to jump. The decimal point of a number is shifted to the right by one place, two places and three places respectively ... The numbers obtained are 10, 100 and 1000 respectively. ...
By analogy, the decimal point of a number is shifted to the left by one, two and three places respectively ... The numbers obtained are one tenth, one hundredth and one thousandth of the original number respectively. ...
Please remember that although the decimal point is small, it has great skills. As long as he stretches and moves, those numbers will get bigger and smaller.
Math diary 2 is a math class in primary school. Teacher Wang raised the chalk. Instead of writing familiar multiplication and division and decimal points on the blackboard as before, she moved Chinese "A", "B" and "D" to the blackboard. I looked at Miss Wang carefully. Her clothes are as simple as usual, and her hair is neatly combed. There is nothing wrong with her! Then why is she so strange today?
Oh! It turns out that Miss Wang wants to teach us "additive commutative law": A equals one addend B, B equals another addend, and C equals sum. For example: A+B = B+A, no wonder she is so weird today. It seems that "the world wonders", this sentence should be changed to "mathematics wonders"! Ha ha!
Primary school math diary 3 One weekend, my good friends from the yard came to my house to play. I was going to play a trick on her and say, "Let's play a game! Each of us can only shout 1, 2, 3, 4, 4. Whoever calls 32 first wins, I'll count. If you lose, you will be punished! I'll shout first, 2! " She thought for a moment and said, "No! You already know the law, I will lose anyway! "
Because 32-2=30, 30=5×6, 5= 1+4=2+3, as long as the sum of the number I shouted with her and the first number is 2, I can win. Originally, I wanted to take advantage of this rule, but I didn't expect to be seen through by her!
It seems that I have to strengthen my math knowledge!
Primary school math diary 4 My mother took me shopping and traveling this evening. I'll buy a math diary first. I see that the price is 1.2 yuan, which is exactly the decimal we learned the day before yesterday. But the ticket says 1.20 yuan. If the trailing zero is removed, it is the same, just like this: 1.2= 1.20. This is exactly what we learned today. There will also be decimals in the things I buy for the trip. Such as: potato chips 6.5 yuan, milk biscuits 1.3 yuan, good times laver 7.9 yuan.
Today, I see decimals are used in many places in my life.
Math diary 5, primary school, learned statistics this week, and I will apply statistics to solve problems! For example, I counted our classmates' hobbies in eating vegetables. There are 4 people who like eggplant, 8 people who eat persimmon, 4 people who eat cucumber and 18 people who eat cabbage. People who like to eat cabbage best. People who dislike eggplant the least. There are as many people who eat eggplant as there are people who eat cucumber. The teacher told us to learn it well and apply it widely in our life.
Primary school math diary 6 Tomorrow is May Day, and my parents will take me to Xiamen to play. After school in the afternoon, my mother took me to Ounan Travel Agency and paid my travel expenses. My aunt from the travel agency asked me a question about the travel expenses. She said, Guangcheng, you three go to Xiamen, and the travel expenses are 1 180 yuan. My aunt will give you a discount on 30 yuan, and then reduce the bed fee in 280 yuan. So how much travel expenses do you have to pay? Because I haven't learned addition and subtraction within 10,000 yuan, my mother just asked me to list formulas, so I listed the following formulas: 1 180 * 3-3 * 30-280, and my mother quickly figured out that the number was 3 170 yuan. Aunt praised me after reading it.
Through this incident, I understand the importance of mathematics and know that mathematics is indispensable in life. Therefore, I will study math hard.
I went to math diary 7, a primary school, to learn dancing tonight, because I didn't bring water. So, we are going to the supermarket to buy a bottle of mineral water. Mom usually buys it, so I don't 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, so the salesgirl's aunt 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!
Primary School math diary 8 Today, my mother and I went shopping in the supermarket, because we will travel together tomorrow.
We bought a toy story ball egg, a 6 yuan, a bottle of Pinker potato chips, a box of Apollo ice cream, 13 yuan 80 cents, three cups of seafood-flavored noodles, 5 yuan, three cups of XO sauce and seafood-flavored 5 yuan, three cups of spiced beef, two Vida rolls, 30 yuan 80 cents, two clean and soft rolls, 27 yuan 80 cents, two breeze rolls and a bag of jiaozi 30 cents.
Primary school math diary 9 This morning, my mother took me to my second aunt's house. Walking to the fruit stand, my mother said, "Buy fresh fruit!" " "I asked my uncle who sells fruits, how much are watermelons and bananas? Uncle said, "A catty of banana 3 yuan and a catty of watermelon 2 yuan. "Mom bought a watermelon, 7 kg, and 5 kg of bananas. Mother gave her uncle 50 yuan money. I thought, how much should I get back? Example:
50-( 14+ 15)
=50-29
=2 1 (yuan)
The money I calculated is the same as the money my uncle gave my mother. I can't tell you how happy I am. Mom looked at me, I don't know why I am so happy. She must think that bananas and watermelons attract me and make me so happy!
Math diary 10 Primary School Yesterday, we learned to shop. The teacher said: "Xiaoming has money since 50 yuan." What can he buy? " ? There are stationery and toys in the shop, as well as vegetables, fruits and drinks. What do you want to buy? "Everyone raised their hands, and the teacher only ordered one classmate, and the students all crowded to buy it. The one who said he would buy a 9-yuan pencil sharpener, a 5-yuan marker and a 32-yuan schoolbag finally said he wouldn't buy anything else. The teacher said, "Who will help him figure out how much it cost? "A classmate raised his hand, and the teacher clicked on this classmate. That classmate is me. I stood up and said, "9 yuan +5 yuan +32 yuan =46 yuan. "
Students applaud for me! I'm so happy.
Math diary 1 1 This morning, my mother went to my second mother's house. When I arrived at the second mother's house, I saw a scale on the floor of the second mother's house. I stood up and weighed myself. I said to my mother, "I weigh 33 kilograms." My mother stood up, too. My mother's weight is 65 kilograms. Mother said, "How many kilograms am I heavier than you?" Example:
65-33 = 32kg
My mother is 32 kilograms heavier than me.
This is my harvest.
Math diary 12 In the afternoon of a primary school, I went to dig bamboo shoots with my father, sister and uncle. When we reached the place where bamboo shoots were dug, we began to look for bamboo shoots. Soon, we found some bamboo shoots, all of which were a little sharp. We dug up all the bamboo shoots we found. Among them, I dug a bamboo shoot, because the hoe was too heavy to dig it out.
Primary school math diary 13 My family has five heaters. It is found that there are five heaters in my house, six heaters in our big bedroom, seven heaters in grandma's house and 15 heaters in the living room. I know that the most heated room in my house is the living room. I also feel that the more debris, the greater the heat generated and the warmer the house.
There are two questions in the math exam this morning that I don't know. They are: the sum of a number and 6 is 12, and this number is (6). There is also a question about the picture column, which I won't write. The first question I wrote at first was 18, and then I thought about it. Is it 6? So I wrote six. I wrote this question in my math exercise book and went home to ask my mother. My mother said, "6+()= 12". I said, "6+6= 12". My mother said, "That's six". It seems that I wrote it correctly. I hope the picture is correct!