I will encounter many problems in math learning, such as: what is the law of numbers being divisible by 2, 3 and 5; For example, is there any simple algorithm to find the greatest common divisor and the least common multiple? All these require me to study slowly and explore in the ocean of mathematics!
Looking up information, discussing with classmates and combining books, I learned that numbers with unit numbers of 0, 2, 4, 6 and 8 can be divisible by 2. Any number with 0 or 5 digits can be divisible by 5. Whether the sum of the numbers in each digit is divisible by 3 will tell us whether this number is divisible by 3.
By learning to find the greatest common divisor of two groups of numbers, I found that if two numbers are multiples, then the maximum number is the least common multiple of these two numbers. If two numbers are prime numbers, then the product of these two numbers is the least common multiple of these two numbers.
The sky of mathematics is colorful, and it is a beautiful scenery produced by the light of reason shooting at the art palace. I swim in numbers, study in numbers, and capture more mathematical knowledge and apply it to reality. Although sometimes you will encounter difficulties, as long as you study hard, discuss with your classmates and communicate with your teachers, you will definitely find the rules and solve the problems!
The following summer vacation, I went to my grandfather's house to play and was warmly received by him. Grandpa's family still burns a big pot with a lot of wood every time.
One day, grandpa took out a pile of wood and said to me with a smile: Liang Xiao, grandpa asked you a question. I agreed with confidence. Grandpa said: This piece of wood in my hand is about 3 meters long. I want to saw it into 20 pieces. How many times do you think I have to watch it? After listening to the question, I was overjoyed It's too simple. I asked my grandmother for a tape measure, and first calculated the length of each section (3 meters =300 cm, 30020= 15 cm), so I worked hard with the tape measure for a long time before I realized that I had to saw 19 times.
My cousin standing by anxiously said, it takes a lot of time for you to calculate this. How many times do I have to saw 3 meters of wood? I thought about it and tried to answer it twice. Cousin asked: how do you calculate? I replied: the number of line segments minus 1 equals the number of saws. Cousin smiled and said, yes, it is necessary to saw 4, 5, 6 and so on. Didn't it save a long time? Grandpa gave you this difficult problem, and there are many solutions, but you should be good at finding the simplest one. This requires you to open your mind and solve problems intelligently. I nodded thoughtfully.
From this incident, I understand that there is mathematics everywhere in life. As long as you are diligent in thinking and asking questions, you can gain more knowledge.
Each of us has a pair of dexterous hands, and everything seems to be inseparable from it. In kindergarten, the teacher taught us to count with our fingers. At that time, we often used ten fingers of one hand to calculate the addition and subtraction within 10. Now, although we don't need to use it to calculate simple addition and subtraction, sometimes we still use it when we do some math problems, such as studying the year, month and day in grade three, and we use it to help us remember the big moon and the small moon.
Once, when I was watching interesting math, I came across a topic: a child was counting his fingers. He counted them in this order: thumb, index finger, middle finger, ring finger, little finger, ring finger, middle finger, index finger and thumb. Which finger is the 36th finger?
At first, I was a little confused and didn't know how to start. Suddenly, I thought of my hands. Why not break them with my fingers? So, I broke up with one hand according to the requirements of the topic. After a while, I found the answer: the 36th finger must be the ring finger. But I am not satisfied, because I think, what should I do if the title asks which finger is the 360th finger? I think this question must be regular. What kind of law is this?
I picked up a pen and wrote on the draft paper. Finally, I found the correct solution: if all the fingers are numbered, and then several are a cycle, then divide 36 by the hand index of a cycle, and what is the remainder, which corresponds to the number of that finger; No remainder means that the number of fingers is equal to the divisor. I wrote: 1 thumb, 2 index finger, 3 middle finger, 4 ring finger, 5 little finger, 6 ring finger, 7 middle finger and 8 index finger on the draft paper. This is a cycle of eight fingers. The remainder I get is 36 divided by 8 equals 4, which is 4, and the number 4 is the ring finger. The answer came out, and the 36th one was the ring finger. Ha ha! This is completely consistent with my previous experiment. In addition, I also found that the index finger, middle finger and ring finger appeared twice in a cycle, and only the thumb and little finger appeared once.
After finishing this problem, I not only felt the wonderful use of my fingers, but also deeply realized the charm of mathematics. In fact, some math problems seem difficult, but as long as we think carefully and make full use of everything around us, we will certainly be able to solve them.