The next day, the math teacher evaluated the homework, and I thought to myself, "The teacher must have piled me up." But the teacher handed out a lot of exercise books late, but there was no my name. The teacher said, "There is a classmate here. When he wrote the answers of triangle and trapezoid, some were divided by two, and some were not. " Needless to say, this must be my book! Later, my mother read my math homework and said, "Fei Ming, when you write triangles and trapezoid in the future, write out the formula and divide it by two, not for convenience." After listening to my mother, I wrote a formula and split it in two.
As a result, on the third day, the teacher said, "The bear writes really well. His triangle and trapezoid are split in two! " "I listened to it, and my heart was as sweet as honey.
"When calculating the graphic area, if it is not divided by two, it will not be divided. If you divide by two, divide it with the formula. " This is my golden key to calculate the graphic area.
extreme
Today, my parents and I went to Qilu in Mo Lifeng to buy stationery. There are many things in it, so I chose some beautiful ballpoint pens and highlighters. Take a closer look, the red label on the ballpoint pen has a downward arrow. I asked my mother, "What does this mean?" Mom replied: "This arrow proves that this product is on sale, so it is cheaper to buy it at this time." I said happily, "Mom, that's great. Let's buy more! " "My mother agreed, but said to me," I can only give you money, and you can go to the bank clerk's aunt to settle the bill yourself. "I hesitated and went away. I took three ballpoint pens and a highlighter, and then I looked at their unit prices, a ballpoint pen 2 yuan and a highlighter 3 yuan. The little brain turns very fast. It should be 2 * 3+3 = 9 yuan. My mother gave me 10 yuan. When checking out, the cashier aunt asked me, "How much do I owe you, little friend?"? "I can't figure it out, but I don't give change." I immediately replied that I would call 1 yuan. Aunt smiled and gave me a dollar coin.
Finally, I went shopping with my parents and went home happily. It was really a pleasant shopping, because it was the first time I paid for it myself.
Tisso
Today, we held a math comprehensive practice competition in Grade Three, which is also my favorite math! I am honored to be selected to take part in the competition.
Let's line up in the multi-function hall first, and we will arrive soon. We saw that the atmosphere there was a little tense. After all, can we not be nervous about the game? Ha ha, get to the point, the exam has already started! I filled in my name first and began to read the papers. I think these problems are very flexible and complicated. I unconsciously did the second big problem, saying: form a rectangle with a 20-meter-long iron wire. Think about how long and wide it is. (There are five answers) I think the first thing to do is to divide 20 by 2 to become 10, so as to make use of the points and combination of 10 and make the last one stand still. 10, are there only 5 and 5 points and combinations left? This becomes a square! I thought about it, by the way, the teacher said in class that squares are also special rectangles. I'm so happy! This test paper will be finished soon. I checked it carefully from beginning to end before handing in the paper.
Through this activity, I understand a truth: I should use what I have learned flexibly in everything I do!