Math diary's 400-word article in the second volume of Grade Four-2065438+0x year x month x day x week x sunny.
Grandma is over seventy years old. She is busy buying food and doing housework during the day and cooking and washing clothes at night. So I decided to save time in my memory, arrange grandma's time reasonably and let grandma have a good rest.
This Saturday, I finished my homework quickly and observed my grandmother's housework: cooking 15 minutes, braising carp 15 minutes, braising potatoes 10 minutes, scrambled eggs with leeks for 5 minutes, mopping the floor for 30 minutes, washing dishes 15 minutes and boiling water/kloc. Is there any way to save time and finish housework? I thought about it, okay? Have a drink. An idea flashed through my mind? Use what you have learned to arrange your time reasonably. I made a plan based on this information.
Time required to do housework at the same time
Cooking 15 minutes, potato stew 10 minutes.
Stir-fried eggs with leeks for 5 minutes.
Braised carp 15 minutes.
Boil water 15 minutes, wash dishes 15 minutes.
The washing machine washes clothes for 30 minutes and mops the floor for 30 minutes.
Total: 75 minutes = 1 hour 15 minutes, saving 60 minutes.
? Is it? I cheered happily. It used to take more than two hours, but now it only takes 1 hour, 15 minutes! I was glad to show the form to my grandmother. She looked at it, gave her thumb and said? Books are not read for nothing! ?
From this, I know that mathematics is very important to us. I will try my best to learn it well!
Math diary, Grade Four, Book Two, 400 words, Article Two, 20 1X Year, X Month, X Day, X Week, X Sunny.
Today, I finished my homework early in the morning. When my mother saw it, she came over and told me to play a game with you! All right! ? I readily agreed.
Mother brought a round cardboard and fixed a rotatable pointer in the center of the cardboard with a nail. The cardboard is divided into 24 grids on average, and each grid is written with 1. 24 numbers. ? Mom, what are the rules of the game? Say it! ? I said impatiently. ? The rules of the game are simple, that is, when the pointer turns to an odd or even cell, the next number must be added. If it adds up to an odd number, I win; If the total is even, you win. ? Mom said with a smile.
I saw that the rules of the game were very simple. I played for more than a dozen times in a row, but I couldn't beat my mother every time. My mother smiled. ? Why is it always singular? I asked my mother puzzled. Mom said:? Think for yourself! ? So, I racked my brains to think, and finally reminded me of the formula that the teacher once said: odd+even = odd. Now I can see that if the pointer points to the odd number, then the next number must be even; If the pointer points to an even grid, then the next number added is odd, so no matter where the pointer points, the number added is odd. Mom won with this rule.
In the world of mathematics, there are many wonderful laws. As long as we learn math well and make good use of it, it is everywhere!
Fourth grade, Volume II, math diary, 400 words, three, 20 1X years, x months, x days, weeks, x sunny days.
Today, I followed my mother to the market to buy food. Mom said:? Today, I will test you whether you can buy a dish you like yourself. ? My mother gave me 20 yuan to watch my performance. ? Make sure the task is completed. ? I said confidently. So, I walked and watched, and came to the vegetable area. At this moment, I saw an aunt selling white and tender fresh mushrooms. I think: the leftovers at home can be cooked with mushrooms. So, I asked the aunt who sells vegetables: Aunt, how much is a catty of mushrooms? That aunt smiled and said to me, little friend, this mushroom is 7 yuan a catty. How much catty do you want to buy? Aunt, I only need to buy half a catty. ? I think: 7 divided by 2 equals 3.5 yuan, 20 minus 3.5 equals 16.5 yuan. After thinking about it, I gave my aunt a note of money from 20 yuan, reminding her that she still needs to find me 16.5 yuan. I went to the meat section again and saw an uncle selling meat, so I asked. Uncle, how much is a catty of meat? 10 yuan Jin. Then I'll buy a catty. ? I thought: 16.5 minus 10 equals 6.5 yuan. I handed the 10 yuan in 6.5 yuan to my uncle.
When I came out of the market, my mother saw that I had all kinds of meat and vegetables. 6.5 yuan smiled and said to me. Learn to buy food! ?
Through this test, I feel that there are many mysteries of mathematics hidden in our lives, and the ability to learn mathematics is really important. And don't be proud, study hard, master more math skills, apply what you have learned and solve problems around you.
After reading math diary's 400 words in the second volume of the fourth grade, I will still read:
1.400 word diary daquan
2. math diary's four 400-word compositions in the fourth grade of primary school.
3. Travel diary 400 words