Math diary 1
In the second grade, my father gave me a question: there are 30 apples, which are divided into 5 parts on average. How many apples are there in each part?
I thought and thought, thought and thought, but I still couldn't figure it out. Seeing that I thought so hard, my father sighed and said, "Let me make you a condition. This problem needs to be calculated by division Division is actually very simple. You just have to learn multiplication well. " After listening to my father's words, a question immediately appeared in my mind. Five times several equals 30, five times six equals 30. Instead, it was changed to the division formula: 30 divided by 5 equals 6, and each share has 6 apples.
Dad praised me as a clever boy.
Math diary 2
My mother went to a meeting this afternoon, and I was alone in my mother's office. I drew a picture on the computer and then went to lie on the sofa for a while. I feel very comfortable. It was a long time before my mother came back. My teeth are very uncomfortable when I eat. I touched them with my hand and my big teeth at the back moved. I lost eight teeth before, and this one is nine. I asked my mother, haven't I finished losing? Mom said that the front fell off and the back fell off. Eating these days is really hard, just like losing your teeth before. Mom said that I lost my tooth because I grew up day by day. Yes, I have grown up. I am seven years old.
Math diary 3
Tonight, I eat jiaozi with my grandparents and parents. Mom ate 15, grandma ate 16, grandpa ate 20, and I ate 8. Grandpa eats the most and I eat the least. After eating, I calculated that we ate 59 jiaozi.
Son, you can calculate according to my diary, can't you? Hey, hey, you must be fine!
I think: Miss Gao will be very happy to see it.
Math diary 4
Yesterday, my grandma and I went to the drugstore and bought two boxes of pills-two boxes of stomach Shu Ning, one box of 52 yuan and one box of 26 yuan. Grandma gave her 100 yuan, and the shop assistant gave it to grandma 48 yuan. After I found the change, I calculated it with decimal addition and subtraction.
Grandma can also pay like this:
1. Pay 50 yuan, the shop assistant, and then 10 yuan asks for 8 yuan.
If grandma has change, she can pay 50 yuan first and then 2 yuan. By buying medicine with grandma this time, I know that mathematics is closely related to our lives.
Math diary 5
Today, my family went to KFC in Longgang for a family meal.
When we get there, people are always crowded. We finally ordered good food and found a seat to sit down. Here comes the food. This is a sumptuous set meal. There are 12 drumsticks in it. I thought: how to divide it equally? Then I remembered the division of 12÷3=4. We each have four drumsticks. Later, I ate my mother's 1 chicken leg and my aunt's two chicken legs. My aunt said, "You can't eat this for free. I ask you, how much did you eat? " How many more servings do you have to eat before you can finish them all? "I thought about it and replied," I ate 7/ 12, and then I ate 5/ 12. I ate all of it. "Fortunately, I learned the knowledge of fractions and can answer the questions correctly.
Math diary 6
Today, I took 30 yuan to go shopping with my mother in the supermarket. When I arrive at the supermarket, I want to spend 5 yuan on the fruit my father likes, 5 yuan on the eggplant my mother likes, 2 yuan on the candy my brother likes, 10 yuan on meat and 2 yuan on food. My mother asked me on the road, "Mingming, do you calculate how much we spent today?" 5+5+2+ 10+2=24,30-24=6
"We spent 24 pieces, and there are 6 pieces left!" My mother smiled and touched my head and praised me: "I have obviously grown up."
We laughed all the way home.
Math diary 7
This afternoon, my mother and I played blackjack with playing cards, that is, we showed four playing cards. Whoever works out the score first will win, and we have a good time. There are many algorithms, and some have only one algorithm. For example: "3,7,8,9", its algorithm is: 3×(9-8+7). Also: 6,7, 1, 9, and its algorithm is: (9-6)×(7+ 1). There are some things that we can't figure out at 24: 1 1, 9,13,7; 8, 9, 10, 1 1, we racked our brains and couldn't figure out a way. Maybe this is the secret of mathematics!
This game is full of fun and mystery!
Math diary 8
We learned to buy things yesterday. 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 9
After dinner on Wednesday night, I washed the dishes. In the past, my father set me too little price and there were few bowls at home, so I raised the price. I washed a big bowl/kloc-0 yuan, 50 points for a pair of chopsticks, 50 points for three pairs of chopsticks, 50 points for a small bowl, 50 points for three bowls and three spoons.
Math diary 10
I learned the number 10 today. The sports meeting is held here. 32 people jump rope, run 16 people, and 26 people play table tennis. My mother asked me a question, that is, how many people participated in the competition? I quickly said that there were 74 people. Mom asked how many more people jump rope than runners? I said there are more people skipping rope than running 18. Mom then asked how many people can jump rope and play table tennis. I also said that there were 58 people skipping rope and playing table tennis. My mother praised me for my good math scores. I'm so happy!
Math diary 1 1
I went to learn to dance 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 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!
Math diary 12
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 can help me a lot!
Last night, my mother went to buy oranges together. A kilo of oranges is 1.8 yuan, and my mother bought 4.5 kilos, which should be 8. 1 yuan. But the clerk is careless and doesn't know how to calculate. It's 9 yuan money. Fortunately, I used the knowledge of Protestantism to do a calculation in my mind this semester and 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 after decimal point in such a small city, but on my way home, my mother also praised me for saving 0.9 yuan for her, and the knowledge I learned can be applied flexibly in my life.
Yes! If you don't learn this math well, it's not only 0.9 yuan that will lose, but also hundreds, thousands or even hundreds of millions!
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