Math diary, the fourth grade elementary school, compiled the second volume of 200 words.

Math diary can improve students' interest in mathematics and deepen their understanding of mathematical concepts. The following is a 200-word math diary model essay in my fourth grade for your reference. I hope it helps you!

Math diary model essay 1

My family is a warm family of four, including my father, mother and brother. My family lives in the west unit of a scenic family on Huaguang Road 12XX, 100 square meter, with two rooms and two halls.

My home is a living room of 20 square meters. There are three mahogany sofas in the living room, one for three people and the other two for one person. In front of the sofa is a coffee table with a length of 1.2M and a width of 0.6m There are many fruit snacks on the coffee table, which I like very much.

In front of the coffee table is a flat-panel TV with a length of 0.95M and a width of 0.5M m. After finishing my homework, I turn on the TV and watch my favorite cartoon-Pleasant Goat and Big Big Big Wolf.

On the left of the living room is my bedroom. The floor of the bedroom is 5.6 meters long and 4.2 meters wide. My bedroom has a desk with many books and review materials, and a 14 inch red notebook computer.

There is a piece of wood crawling up and down on the bed behind the desk. Bed length is 2M, width1.2M, bed length is 2m, width1.2m.. When I am tired, I will lie in bed and rest. At night, I will sleep peacefully here until dawn.

Out of the bedroom is a rectangular kitchen. Whenever I am thirsty, I take out my drink from the refrigerator. The refrigerator is 0.8 meters long and 0.5 meters wide, which is very small.

I like my home very much. My father, mother and brother all love me very much. I grew up happily in this family.

The fourth grade of primary school Volume II math diary Fan Wener

Today, I want to measure something at home. Let me measure the surface of the coffee table first: I took out a long meter ruler, put it in a small hole, and put a small board on my head to keep it from moving. Wow, the length 1 m 1 decimeter, that is 1. 1 m, the front of refrigerator 1.56 m, the TV1,the bed 2.04 m and the bedroom floor 4.5 m? I find the decimal point is very important in it. If you forget the decimal point in 1. 1 meter, it becomes 1 1 meter. Wow, it is 10 times higher.

I also want to see the height difference between my parents and me. I took out the meter ruler and measured my parents and me respectively: the highest height of my father was 1.67 meters, the difference between my father and me was 0.36 meters, the second height of my mother was 1.57, and the difference between my mother and me was 0.26 meters. I want to grow taller than them quickly! The decimal point is also very important here, because if you remove the decimal point from 1.67 meters, it will become 167 meters, a giant in the sky, and even I will become a giant in the sky, 13 1 meter.

You can't ignore the problem, because if you ignore it, 100 will be done in vain. For example: 1.6+2.4, you can read it as 16+24=40, and for another example: 6.8-6.1(=)1.2-0.5, you can't see it clearly without looking carefully, which is easy to make mistakes! what do you think? Do you pay attention when you do your homework?

Now I know that the decimal point is very important in decimals, and it is also very important in life. If there is no decimal point, only integers, then the world will be chaotic!

The fourth grade of primary school Volume II math diary Model essay 3

Today, my grandmother and I measured the coffee table, bed, refrigerator, bedroom floor and TV side by side 1 time. In measurement, their lengths are integers and decimals. I calculated the perimeter and area of all the measured objects, which greatly improved my decimal multiplication ability.

In the process of operation, grandma pointed out many small mistakes to me, and I deeply realized the importance of decimal point. For example, when calculating the area, my TV is 0.8 meters long and 0.6 meters wide, so I will write it as 4.8 square meters. This result happened to be seen by my dad. He quietly led me to the TV: "How big do you think this TV is?" Then give me a rough picture of an area of 4.8 square meters with floor tiles. The difference between 0.48 square meters and 4.8 square meters is too big! I have a perceptual knowledge of the size of objects.

After a while, I measured the heights of my parents respectively. Father1.7m, mother1.64m, and my height1.3m.. Father said: addition, subtraction, multiplication and division of decimals have been done. Let's calculate fractional division. Excuse me, how tall is dad's son? I quickly said: 1.7? 1.3 Calculate the answer slowly. ? I calculated the answer nervously. 1.37692 Dad smiled and asked:? According to the rounding principle, what is the number of digits after the decimal point 1? 1.3 two digits 1.3 1 three digits 1.308? Then dad asked:? This is a cyclic decimal. Where is its cyclic node? Click the first 3 and the last 2 respectively, and grasp it carefully! ?

Through this practical activity, I improved my practical operation ability. I am fully aware that I should study hard. A small mistake in the decimal point can often make a difference of ten times or a hundred times, which will lead to a big joke. A small mistake, thousands of miles away? All right!