Yesterday, my grandma and I went to the drugstore and bought two boxes of pills-Shu Ning, 52 yuan and 26 yuan. Grandma gave her 100 yuan, and the shop assistant gave it to grandma 48 yuan. After I found the money, I calculated it by adding and subtracting decimals. Grandma can also hand it in like this: 1. Pay the clerk 50 yuan first, and then pay 65438.

Yesterday, I got 95 points in the math tutoring exam. I made a mistake on a fill-in-the-blank question and a text question. The teacher reviewed the fill-in-the-blank questions for us before the exam. I didn't recite it carefully, but I remembered it carefully. I was thinking about something else when I recited it, and I didn't remember it at all. So when I took the exam, I couldn't remember it anyway, so I just filled in the numbers. I didn't see the meaning of the question clearly and put it. " The first question 1 is because my attitude in the exam is incorrect, and the second question is because I didn't review it carefully. I will definitely do these two things in the future, but I can't be careless. Teacher, I can't get satisfactory results in every exam. Since I learned interesting mathematics, I understand that the most important thing in learning mathematics is understanding. It is useless to copy other people's answers, so I will listen carefully in the future, so that I can get excellent grades.

Math diary —— A Preliminary Understanding of Scores

( 1)

Today, my family went to KFC in Longgang to have a family fun.

When we got there, people were always crowded. We finally ordered good food and found a seat to sit down. Here comes the dish. It's a big set meal. There are 12 chicken legs in it. I thought: how can we split 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. Let me ask you, how many points 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 them. "Fortunately, I learned the knowledge of fractions and can answer questions correctly.

(2)

Today, my mother gave me 10 yuan to go shopping in the supermarket. I bought a string of firecrackers, four lollipops, seven balloons and a comb. A * * * uses 2/10+110+2/10+4/10 = 9/10. I have to return one yuan to my mother.

When I got home, my mother ate 1/4 lollipops, my father ate 1/4 lollipops and I ate 1/4 lollipops. I left one and gave it to my brother Xiao Qiang next door. (Author: Xiao Enling)

(3)

Last week, we studied fractions. Fractions have numerator, denominator and fractional line, such as 1/3, where 3 is denominator, 1 is numerator, and the middle horizontal line is fractional line.

Scores are used in many places in life. For example, a book has thirty pages, and each page is 1/30 of a book. Scores can also be added or subtracted! For example, half plus half equals two, which is 1. Why? If you divide a cake into two parts, each part is 1/2 of the cake, and then put the two parts together, there are two pieces 1/2, which is just a cake. When adding and subtracting fractions, if the denominator is the same, only the numerator is added, regardless of the denominator. And the numerator and denominator are 2/2 the same, that is, 65438+.

I also learned to compare the size of fractions. The teacher taught us the formula: numerator is the same as denominator, the fraction with large denominator is small, and the fraction with small denominator is large; The denominator is the same as the numerator, with the larger numerator having a larger score and the smaller numerator having a smaller score.

The teacher also reminded us that when writing scores, we usually write the fractional line first, indicating the average score, then the denominator and finally the numerator.

1. This morning, my father and I watched the Olympic torch relay program in Shenzhen online. I saw many people holding big red flags and small red flags and shouting, Come on, China, Olympics and Beijing. Very lively. I heard from my father that there are 208 athletes in Shenzhen. Each athlete ran 200 meters, and 208 athletes finished running and finally arrived at the city gymnasium. My father asked me if you knew they had all run away. Can you work it out? I said yes, I thought about it, calculated step by step with the addition I learned, and the final result was 4 1600 meters. Dad was right after reading it. You are so smart, dad said. Do you know how many kilometers it is? Dad gave me a rule, 1000m = 1km, and said that you would know by calculating according to this rule. The first time I made a mistake, but the second time, under the patient guidance of my father, I finally figured it out = 4 1km, 600m m. My dad praised me for being great. Finally, I told my dad that I also wanted to participate. My dad said that you should study hard in the future. I also want to cheer for our motherland. I also want to take the Olympic torch. This morning, my father and I watched the Olympic torch relay in Shenzhen online. I saw many people holding big red flags and small red flags and shouting, Come on, China, Olympics and Beijing. Very lively. I heard from my father that there are 208 athletes in Shenzhen. Each athlete ran 200 meters, and 208 athletes finally arrived at the city gymnasium. Can you work it out? I said yes, I thought about it, calculated step by step with the addition I learned, and the final result was 4 1600 meters. Dad was right after reading it. You are so smart, dad said. Do you know how many kilometers it is? Dad gave me a rule, 1000m = 1km, and said that you would know by calculating according to this rule. The first time I made a mistake, but the second time, under the patient guidance of my father, I finally figured it out = 4 1km, 600m m. My dad praised me for being great. Finally, I told my dad that I also wanted to participate. My dad said that you should study hard in the future.

2. Mathematical problems on the court

One day, I watched the sports channel with my mother and learned a lot. For example, the race needs to be timed, and the knowledge of hours, minutes and seconds in mathematics can be seen in the swimming competition.

The track of track and field competition is also very knowledgeable. For example, when starting at 400 meters, the athletes are not at the same starting line, so they have knowledge of circumference in mathematics. Some games have scores, such as comparison in basketball, which is the knowledge of comparison in mathematics. There will be many numbers in the competition. For example, the number of athletes is an integer, and the number of shots will be accurate to the decimal point. In addition, the finals of 1/8 and 1/4 that we often hear are all scores. The stadium has many names, such as 200m,100kg and so on. The results of some competitions need to be averaged, which requires both knowledge of calculation and knowledge of averaging. There are also some competitions that are very knowledgeable. Such as round robin, knockout. These will all involve the combinatorial knowledge of rice in mathematics WAN169022014-10-24.