Math diary 100 sub, no more than 100 sub.

1) Mathematics gives me a lot of memories.

Math, math I love you like mice love rice. Do you know why I love math? Because of the charm of mathematics, I was fascinated by it.

Today, I learned a new thing, and that is the simple algorithm of addition and subtraction. After learning the simple algorithm of addition and subtraction, my calculation speed is much faster, and learning to calculate is easier. Let's give you an example!

For example: 367+498=? All I have to think of is this:

I thought of 498 as 500 to add, and then used 367+500, and found that I added 2 more, so I subtracted 2 from the sum and got 865. And what about 796+295? I think so:

796 can be seen as 800 to add, and 295 can be seen as 300, one adds 4, and the other adds 5, so the equation becomes 800 + 300-4-5 = 1091, voila, how convenient!

After learning the simple algorithm of addition, it is much easier to learn the simple algorithm of subtraction. For example: 483-299, hehe, with a slight movement of my head, there is a way.

I first see 299 as 300 to subtract, because I subtract 1 more, so as long as 1 is added to the result, it is 483-300+1=184, so it is much better. However, I can warn you: it is better not to use the idea of subtraction to calculate the subtraction, or it will be troublesome!

Now, I like math more and more because it allows me to learn to calculate results quickly, and math really makes me memorable!

Today, I went shopping at IKEA with my mom.

As soon as we entered the mall, we began to purchase, we first took a fancy to a black swivel chair, hit **, cheap, 299 yuan, my mother and I immediately counted this swivel chair on the shopping list, we bought a broom and dustpan, because it is a member, so the membership price spent a total of 78 yuan, and then bought a body lotion and spent 19 yuan, and then we bought two pots of plants and a flower pot, a total of yuan, and then we bought a filter bowl, bedspread, and other daily necessities all (including the above) spent yuan. I spent yuan for lunch in the middle of shopping, and after shopping, I spent yuan on drinks and biscuits during the break.

Okay, let's carefully calculate the amount spent today. Wow, it costs so much, I don't know yet! I think about it carefully, when we buy something, the business will pay taxes to the state, and I heard that the school is compulsory education, and the school has to pay the salaries of the teachers, and the state pays the salaries of the teachers with the money collected by the state.

Therefore, we must make good use of the knowledge imparted to us by our teachers and study hard, so that we can live up to the hopes of the country and the people, learn knowledge well and become talents for building the country, and study high technology well, so that the gap between our country and other countries' science and technology will gradually narrow, or even surpass them!

Mathematics is an indispensable tool for people's life, work and learning, which can help people better explore the laws of the objective world, make appropriate choices and judgments on a large number of complex information in modern society, and provide an effective and simple means for people to communicate information. Mathematics provides language, thinking and methods for other disciplines, is the basis of all major technological developments, mathematics has a unique role in improving people's reasoning ability, abstraction ability, imagination, and creativity, mathematics is a kind of human culture, its content, ideas, methods, and language are an important part of modern civilization. In this digital age, learning mathematics well will be much less confusing than others, and we should firmly believe that mathematics has incomparably powerful power.

Therefore, if we learn this basic knowledge well, and then study the knowledge of other disciplines, we will feel handy and comfortable! Contribute to the development of the country!

Enough is enough.

24 hours is really omnipotent, if you don't believe me, let's take a look at how I spend the weekend: first, wake up at 7:30, then 7:00

45--- 8:00 wash your face, 8:00---8:00

15 breakfast, 8:15--- 9:15 homework, 9:

15---10:30 watch TV, 10:30---11:

00 lunch, 11:00--- 15:00 nap, 15:00

00---16:00 play, 16:00---17:

30 watching cartoons, 17:30--- 18:00 dinner, 18:00

00---20:00 Watch TV, 20:00---21:

00 hit the computer, 21:00 sleep. Isn't the 24-hour method great?

If you have this idea, be sure to keep a journal like this!

The math diary is about 100 words as follows:1.Today, my mother gave me 50 yuan and told me to buy fruits and vegetables, I bought a bag of apples for 6 yuan, cucumbers for 2 yuan a catty, shrimp for 28 yuan, a bag of strawberries for 5 yuan, how much yuan do the salesman ask me?

In my mind, I listed the formula: 50-6-2-28-5=41 (yuan), and quickly said that it would cost 41 yuan. The salesman then asked

How much more can I get you? I said they would ask me for 9 yuan. The salesman praised me for being awesome, I was very happy, and when I got home, I gave the rest of the money to my mother, who smiled with satisfaction.

2.Today, I made a total of three dumplings at home, and I counted 68 in a pot. That's when my dad asked me

If there are six people eating, how much each person gets. "I wrote an equation: 3 68 6=, and I thought:

First of all, I calculated how many dumplings there were, and I calculated that there were 204 in total. Knowing the total number of hinges, and knowing that it is divided equally among 6 people, it is very easy, 204 6=, and the result is 34. I told my dad to eat 34 dumplings each.

It turns out that mathematics is also inseparable from life.

3.Today, our family went to KFC in Longgang to eat the whole family**. When we got there, there was a crowd of people, and we finally ordered a good meal and found a seat to sit down.

The dish is here, it's a big bucket **. There were 12 chicken thighs in it, and I thought: how do you divide them evenly?

At this point, I remembered the division 12 3=4. We each had four chicken legs, and I later ate 1 chicken leg from my mother and 2 chicken legs from my aunt, and my aunt said, "This can't be eaten in vain, let me ask you, how much did you eat?"

How many more servings do you eat and eat them all? I thought about it, "I ate 7 12, then 5 12 and I ate it all."

Luckily, I learned about fractions and was able to get the questions right.

Mathematics diary closely links life with mathematics, it makes students full of curiosity about mathematics-related matters around them, makes students happy to contact mathematical information, and cultivates students' interest in mathematics outside the classroom. The following is a collection of more than 100 words of sample essays for math diaries, welcome to read!

Friday, February 5th, 20xx The weather is fine.

Dad asked me a question, one kilogram of cotton flowers or one kilogram of iron, which is heavier? I said, "Iron weight."

Why? Dad said. I said:

No, it should be the same weight. "Wrong, under normal circumstances, iron is heavy, because iron is dense and small in size and buoyant, so iron is heavy. In a vacuum, the same weight.

Dad said. 6th Grade Math Diary 100 Words 2: 6th Grade Math Diary (122 words).

Saturday, June 11th Sunny weather.

Today my grandma and I went to the store to buy groceries. I first bought a bottle of shower gel for 28 yuan, and then bought 4 pieces of soap, one yuan. When I went to check out, I calculated a total of 42 yuan, I gave the cashier 100 yuan, and the cashier found me 58 yuan.

Equation: 28 + yuan).

100-42=58 (yuan).

September 9, 20xx.

Although the head of the decimal point is small, I know that the decimal point is not small.

For example, yuan, if the decimal point is missing, doesn't it become 380 yuan? What a big difference between yuan and 380 yuan! With such a comparison, can't we see how much the decimal point is useful?

Many students often leave out the decimal point when writing, so the number is not the number you originally wanted to write. So let's stop making this big mistake!

Wednesday, August 2, 20xx Sunny.

Today I ate a 20 cm fritter and a 10 square centimeter flatbread for breakfast, and after eating, I used a long decimeter pen to write homework in a homework book of about 3 square decimeters. When I walked out the door, I saw a 12-centimeter flower, blooming on this less than 19 square meters of land. There is also a small fish of meters swimming in the pond of 20xx square centimeters.

Wednesday, October 10 Fine.

Today, Dad taught me a simple algorithm for multiplying two digits with the same mantissa complementarity, which is to multiply the first number by another first number plus 1 as the thousands and hundreds, and then use the product of the two mantissa multiplied as the ten digits and single digits of the product, such as 63*67=?Use 6*(6+1)=42 as the thousand and hundred digits of the product, and then use 3*7=21 as the ten and unit digits of the product, and the product of this problem is 4221.

Wednesday, October 10 Fine.

This afternoon, my mom and I played 24 with playing cards, which is to show four playing cards, and whoever calculated it first to count 24 wins, and we had a great time. There are many algorithms, and there are some that have only one algorithm. For example, "Its algorithm is: 3 (9-8+7)." Also:, its algorithm is: (9-6) (7+1). There are also some that we can't count twenty-four, they are: We can't think of a way to do these things even after racking our brains, maybe this is the mystery of mathematics!

This game is full of fun and mysteries!

Grandpa reckoned faster than me.

I was having fun with my sister, and my grandmother called me in and asked me to settle an account for her.

Grandma bought 3 catties and 4 taels of eggs, the price per catty is 3 yuan and 5 jiao, grandma paid 12 yuan, how much should I get back? As soon as Grandma's words fell, Grandpa said, "Find 1 dime!"

I didn't believe that my grandfather could calculate so quickly, so I used the math I had learned to calculate: unit price multiplied by quantity = total price; The money paid and the money spent = the money recovered, which is exactly the same as the grandfather's score, looking for 1 dime. I asked Grandpa why he counted so quickly.

It turned out that the grandfather divided 3 yuan and 5 jiao.

3 yuan + 5 corners, first multiply by 3 = yuan, and then multiply both.

Half of it was 17 yuan, so it cost a total of 12 yuan, and of course a dime.

Finish. After my grandfather finished speaking, I understood that he used the multiplicative distributive law.

Through this incident, I realized that mathematics can be used everywhere around us. Let math do the work for us!

Solve the problem yourself.

I thought about it for a while, but I didn't come up with it. I thought again, the angle 1 = 70 degrees, it overlaps, it is equal to two 70 degrees, that is, 70 2 = 140 degrees. Then use the inner angle of the triangle and 180 degrees - 140 degrees = 40 degrees.

It's as simple as that, as long as you think well and use your brain more, it's done.

The correct equation is: 180-70 2

40 (degrees).

Today, I made an appointment with my classmates to go out for a picnic, and I went to the supermarket to buy a drink, a bottle of 5 yuan; 2 yuan for a loaf of bread, buy 3 pieces; a pack of beef jerky 3 yuan and 6 jiao; $2 for a hillbilly chicken leg.

My aunt smiled and said to me: a total of 15 yuan, I gave my aunt 15 yuan, and when I walked out of the supermarket, I calculated: no, 5 + 2 3 + yuan), my aunt took more yuan, and I gave it to my aunt. Auntie says "You're such an honest child"!

I'm glad that mathematics can also teach me how to be a human being.

Can you make it clear? Are you an elementary school student? Middle school, high school?

How do I write, the type of wrong question, or theoretical analysis.

You can find me on my QQ.

This morning, I started the "launching ceremony" of reviewing math, practicing math, and strengthening math according to the "holiday plan" that my dad asked me to write!

At first, I thought it was a bit difficult, but the more I did it, the easier it became, and I thought math was so interesting! For example:

There is a five-digit number, the lowest digit is 8, the highest digit is 3, the number in the single digit is 2 times the number in the ten digit, the sum of the first three digits and the sum of the last three digits are 19, what is this five-digit number?

Answer: First calculate the highest and lowest digits of this five-digit number, then count the ten digits 8 2=4, then calculate 8+4=12 19-12=7, and finally calculate 3+7=10 19-10=9, this five-digit number is 39748!

I didn't like math before and thought it was boring, but now I think math is so simple and interesting! You'll love math!

1.The apple trees in the orchard are three times the size of the pear trees, and Master Wang fertilizes 50 apple trees and 20 pear trees every day, and after a few days, all the pear trees are fertilized, but there are still 80 apple trees left unfertilized. I ask you: How many apple trees and pear trees are there in the orchard?

I wasn't intimidated by the question, the puzzle piqued my interest. I think that apple trees are three times the size of pear trees, and if two trees are to be fertilized on the same day, Master Wang should fertilize "20 3" apple trees and 20 pear trees every day. In fact, he only fertilized 50 apple trees every day, 10 of which were missing, and finally a total of 80 of them were missing.

20 pear trees a day, 160 pear trees in 8 days, and according to the first condition, we can know that there are 480 apple trees. This is to solve the problem with a hypothetical idea, so I think the hypothesis method is really a good way to solve the problem. 2.

Mathematics is everywhere in life. For example: Grocery shopping!

Buy stationery! Measuring cloth and so on, all need to use mathematics. This semester, the teacher taught a new knowledge, which is the multiplication and division of decimals.

This knowledge has helped me a lot! Last night, my mom went shopping for oranges together. The oranges are a pound of yuan, and my mother bought a pound and should have paid for it.

But the salesman was careless and didn't know how to calculate it, so it was calculated as 9 yuan. Fortunately, I used the knowledge of this semester's Protestant, and after doing a few calculations in my head, I immediately corrected the salesperson's mistake. Not only did the salesman praise me for being smart, and I knew how to multiply and divide decimal numbers so young, but on the way home, my mother also praised me, saving her yuan, and the knowledge I learned could be used in life.

Oh, yes! If you don't learn this math well, you will lose not only this yuan in the future, but maybe hundreds, thousands, or even hundreds of millions! Provide two Choose for yourself!!

3.Today, I took 10 yuan to the 3rd floor of Haoyouduo supermarket to buy books.

I searched and found a copy of "Myths and Legends", and as soon as I looked at the cover, I knew that there were many wonderful stories in it. I decided to buy it, but when I saw the price, I was stunned, and it turned out that the book was 11 yuan. I was reading this book and feeling for the money in my pocket, which really embarrassed me!

The saleswoman saw my embarrassed look and asked kindly, "What's the matter, little friend?" I said shyly

I want to buy this book, but I don't have enough money. She asked, "How much money did you bring?"

Only $10. I said:Auntie smiled and said:

Children, you see that the pricing board also reads, 'Discount books, all 10% off'. I asked, "What do you mean by 'all 90 folds'?"

The aunt said: "It is to collect money according to nine-tenths of the list price, for example, a book of 10 yuan is only charged 9 yuan." ”

I did the math, and this book only costs 9 yuan and 9 jiao. "That's right! I thanked my aunt repeatedly.

Today, I am so happy that I have not only bought a satisfactory book, but also learned knowledge!