Diary of the first volume of sixth grade mathematics 100 words 1
20 1X year x month x day sunny day
What I can't understand most is why a year with the integer 100 is a multiple of 400, which is a leap year. For example, 1800 can be evenly divided by 4 in the first academic year of the sixth grade of 20 mathematics, and it should also be considered as a leap year. Why must it be a multiple of 400?
In order to find the answer, I rummaged through the books, but I couldn't find the answer. I only got one data. The revolution time of the earth is 365 days, 5: 48: 46. I think, hey, maybe it can be calculated like this.
Do it. I'll convert 5: 46 seconds into 20926 seconds. There are 86400 seconds in a day, and it takes 20926 seconds. 86400? 0.2422 (days), which is the number of days that people miss every year, so this number multiplied by 4 equals 0.9688 days. For the sake of simplicity, people regard it as a day. From this, 1-0.9688=0.032 (days) =46 minutes and 4.8 seconds, and then use 46 minutes and 4.8 seconds? ( 100? 4)= 19: 12, that is, the extra time calculated every hundred years, which people regard as a day that has not been posted in other 99 years (100- 1), so it is 24-19.2 = (400? 100)= 19.2 days, which is nearly one day, so there is another leap year in 400 years, that is, 100-3=97 (pieces), so there are only 97 leap years every 400 years.
Diary of the first volume of sixth grade mathematics 100 word 2
20 1X year x month x day sunny day
Today, my mother asked me to draw a shape. I found that the four sides of a square are the same length. Three sides of a triangle have the same length, and some sides have different lengths. Two long lines and two short lines form a rectangle. So, I know that lines can form various shapes.
Diary of the first volume of sixth grade mathematics 100 word 3
20 1X year x month x day sunny day
Today, I carefully looked at my phone. It has 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 and *, # on it. I found that these numbers make up many telephone numbers through different arrangements. My home phone number is 63732 156 and my father's phone number is 138. The first volume of mathematics in grade six is 3578. Numbers are so useful!
Diary of the first volume of sixth grade mathematics 100 word 4
20 1X year x month x day sunny day
Today, Geng Jian and I went swimming in the air force compound. I swam five laps in breaststroke and six laps in freestyle. The swimming pool is 50 meters long, and I swam 550 meters at a time. 50+50+50+50+50=250 (meters) 50? 6=300 (meters) (taught by parents) 250+300=550 (meters).
Diary of the first volume of sixth grade mathematics 100 word 5
20 1X year x month x day sunny day
Every day my father drives me to school. When I walk to the crossroads, I find there are computer numbers under the traffic lights. When it turns red, the number changes from 50, 49, 48 to 0. When the red light turns green, we can cross the intersection. So you can know how long it will turn green by looking at the computer numbers.
Diary of the first volume of sixth grade mathematics 100 word 6
20 1X year x month x day sunny day
There are five heaters in my house. It is found that there are five heaters in my house, six heaters in our big bedroom, seven heaters in grandma's house and 15 heaters in the living room. I know that the most heated room in my house is the living room. I also feel that the more debris, the greater the heat generated and the warmer the house.
Diary of the first volume of sixth grade mathematics 100 word 7
20 1X year x month x day sunny day
Today, mom and dad came to the mall to buy things, and finally settled at the cashier. A total of 292.53 yuan, my mother gave me 300 yuan. The change of 7.47 yuan can be calculated as follows: 300-292 = 88-0.53 = 7+1-0.53 = 7+0.47 =
Diary of the first volume of sixth grade mathematics 100 word 8
20 1X year x month x day sunny day
A century has 100 years; There are 365 a year? 366 days; There are 12 months in a year; 28 a month? 3 1 day; There are 24 hours in a day; There are 60 minutes in an hour; There are 60 seconds in a minute; There are 100 milliseconds in a second. Current time: 2 1 century, March 2, 20031,13: 25, 30 seconds and 49 milliseconds. I can record this time, but I can't stay still.