There is a lot of mathematical information in life, and we can't live without mathematics at any time!

Speaking of math, I met an interesting math problem today.

Today, while waiting for broadband connection, I sat down and picked up the Happy Life of Garfield, which my mother bought for me. I saw the profile of Garfield. When Garfield appeared on the big screen in 2005, it was his 26th birthday. I told my mother about it. My mother asked me if it was 20 13. How old is Garfield now? As soon as I heard it was a good question, I began to count the years: 26 in 2005, 27 in 2006, 28 in 2007, 29 in 2008, 30 in 2009, 365,438+0 in 2065, 438+03 in 2066 and 32 in 2066. But I think it's too much trouble, just thinking about the difference between 2005 and 13. I can subtract 5 from 13 to know the difference. 13 minus 5 equals 88 years. I add these eight years to his current 26 years, and I will know how old he is now! Eight plus twenty-six equals thirty-four Garfield is 34 years old. I know how to calculate age.

Students, there are many math problems in life. I solved a problem today, and there are still many problems waiting for me to explore and discover. I know, the result is definitely different, just like today's math problem. Learning math is very interesting.

Part II: Measuring the circumference of the TV.

Today, I finished everything and felt bored, so I went to measure the circumference of the TV. When I measured the circumference of the TV with a ruler, I found that the ruler was not long enough. I thought, "What should I do?" It suddenly occurred to me that what xu teacher taught me today, we can use lines to measure. With this in mind, I started to do it. I cut a long white line and began to measure. When I was about to finish measuring, I found that the line was not long enough, but I didn't want to cut it, so I thought, "How can I make it simpler?" I went back to my room and picked up a book to read. After a while, I found a simpler method. Because my TV set is rectangular, which only takes up one length and one width. I picked up the thread and measured it. After a while, I measured it. One length and one width is 106 cm, but there are two lengths and widths, so 106 times 2 equals 2 12 cm. It turns out that the circumference of my TV set is 2 12 cm.

I know that when measuring the circumference of an object in the future, if you can think of a simple method, use a simple method.

Article 3: Buy books.

Today, my father and I went to the bookstore to buy books.

We came to the bookstore. I picked out a long-awaited book and went to the cashier. Dad said, "Your book 12.6 yuan, my book 16.3 yuan, I took three ballpoint pens, 1.5 yuan. How much is left in 50 yuan? If you guess right, the rest of the money can buy you ice cream. " I think: 50 minus 12.6 plus 16.3 plus 1.5 times 3 equals 16.6 yuan. I said, "16.6 yuan." "Well, this 16.6 yuan can buy you an ice cream." Dad said happily

When I arrived at the ice cream shop, my father asked me again, "I bought two ice creams with 1.5 yuan and paid 16.6 yuan. How much is left? " I think: simple, 16.6 minus 1.5 times 2 equals 13.6 yuan. I said, "There is 13.6 yuan left." Dad said, "Not bad! Not bad. " I said angrily, "You underestimate me. This is a topic for two years. If I can't even know these, am I still a fifth-grade student? "

Mathematics is inseparable from life.

Chapter four: mental arithmetic

One night in the summer vacation, my mother took me to the 60-episode Lianhua supermarket. I saw so many people in the mall! There are many things in it, such as stationery, food, clothing, alcohol, tobacco, toys and so on. My mother and I bought seaweed, milk, jelly, drinks, shredded squid, shower gel, socks, plums, vanilla and chocolate. Their prices are: 23 yuan, 9 yuan, 3 yuan, 5 yuan in June, 28 yuan, 3 yuan, 40 yuan, 6 yuan, 1 yuan,1yuan. In front of the checkout counter, mother said, "son, can you compare the speed with your aunt?" Calculate the amount to be paid? "I know my mental arithmetic ability is not very strong, so I quickly found a piece of paper and a pen, and calculated it quickly and seriously, but it is still not as fast as the assistant aunt's computer. When I told my mother the result, my aunt had given my mother all the money I was looking for. I checked our calculation results, but I didn't expect to get it right so soon, and my mother praised me, but I know I will improve my mental arithmetic speed in my future study! As long as I work hard, I will make progress.

Chapter five: Mathematical problems in life.

I saw a topic "Mathematics in Life" in my math textbook today. The topic is: "China's population is about 654.38+0.3 billion. If we save 654.38+0 cents per person per day, if so, our country will save about 6.5438+0.3 million yuan. If primary school students need to save about 65438+ tens of thousands of dollars from grade one to college, then this money can be provided to 1805 children who are out of school and have no money to go to school. Wouldn't it be nice to give these money to those people? "

After reading the above information, I thought: many hands make light work. Suddenly I remembered, many hands make light work? Not good, because I thought about it: if this population of about 65.438+300 million wastes 65.438+0 drops of water, then a * * wastes about 65.438+300 million drops of water, then what do you think is 65.438+300 million drops of water?

I did a small experiment: I put 1000 drops of water under the tap and weighed them with a scale. The weight of 1000 drops is 200 grams. I wrote another calculation.

1300000000÷1000× 200 = 260000000 (g)

260000000 grams =260 tons

I really don't know, it's shocking: if everyone uses one ton of water a month, then 260 tons of water can be used for two years. I went to ask my father, "How many kilowatt hours can a ton of water generate?" Dad said, "1 ton of water can generate 100 kwh of electricity." This means that 260 tons of water can generate 26,000 degrees of electricity.

Wow! I was shocked at once. 260 tons of water can play so many roles! So we should save all the water now, don't waste a drop of water, we should form a good habit of saving, and we can't waste any more.