Math diary usually includes the following:

Knowledge points, key points and difficulties in learning;

Understanding and understanding of mathematical concepts, formulas and rules;

The process of analyzing and solving mathematical problems;

My own gains and shortcomings in mathematics learning;

Planning and planning of mathematics learning, etc.

Math diary of second-year students can refer to:

( 1)

Today, I found many math problems at home. For example, there are 9 stairs on each floor of our corridor and 5 floors, so there are 45 stairs. My mother asked me how many hands there are in my family. One has two hands and five people have several hands. I immediately replied: "There are 10 hands." At lunch, everyone used two chopsticks, and I took 10 chopsticks for five people. Mom told me that there are many math problems around us, so you should look for them carefully.

(2)

Today, my mother gave me a special task: go shopping with my father, and I'll settle accounts. 4 yuan bought two Jin of pork liver, cucumber 1 yuan 50 jiao a Jin, and egg 2 yuan 50 jiao 1 Jin. 4×2=8 yuan, 1.5×2=3 yuan, 2.5×4= 10 yuan, 8+3+ 10=2 1 yuan. I calculated all the accounts today, and my father praised me as his little helper. I am so happy in my heart!

(3)

During the summer vacation, my mother signed me up for a swimming class in Huainan and asked me to learn swimming. On the first day, my mother and I went to 6 yuan by bus, and we stayed in the fitness center for 40 minutes. The fitness center has five floors and the swimming pool is on the third floor. The swimming pool is very big, with eight floors of waterways. 15 Children learn to swim. After 12 days of study and training, I finally learned to swim. The coach praised me as a persevering little man!

(4)

Today, my parents and I got up early and were going to eat breakfast. Mom and dad let me go shopping on purpose. I bought three rolls, one with 30 cents and three with 90 cents. I also bought two sesame cakes, one for 30 cents and two for 60 cents. I also bought my favorite red bean porridge, one yuan a bowl, and a bowl of wonton, one yuan and fifty cents. I spent four yuan (9jiao+6jiao+1 yuan+1 yuan.5jiao =4 yuan). By buying things, I know that things with the same price are easier to calculate by multiplication than by addition.

(5)

Today, Teacher Yang and we created the first formula of a martial arts secret. There are nine tricks in this formula * * *, which is actually a multiplication formula of five in the book, but it is different from the book. The book is: 5,2515,3515,4520,5525,5630,5735,5840,5945.

Ours has changed from 5630 to 6530, 7535, 8540 and 9545; Do you know why ours are different? Because we are compiled according to 15, 25, 35, 45, 55, 65 ... so that every time the first number is added with 1, the second number remains unchanged, and the result is added with 5. How easy to remember!

Teacher Yang asked us to choose one, and we all chose to do it ourselves. The teacher also praised us for being more capable than our uncle who made books!