三年级数学日记【4篇】

很快一天又过去了，想必大家都学习了不少新知识，想必是时候写一篇日记了。日记你想好怎么写了吗？下面是作文迷的小编为您带来的三年级数学日记【4篇】，希望能够给予您一些参考与帮助。

内容导航

数学日记 篇1数学日记 篇2数学日记 篇3关于数学日记 篇4

数学日记 篇1

探索角的秘密

Explore the secrets of the corner

陈墨

Chen Mo

我去江心屿游玩，发现了许多角的秘密。

I went to Jiangxinyu Island and found many secrets.

我坐上轮船，发现船上的台阶是90度的，发现悬挂在船上的救生圈是红白相间360度的，发现江上的黄色的浪是半圆形180度的，好像夸父在奔向大海。随着“嘟”的一响，船开动了，隐隐约约看到两个人向江心屿游去，游泳的姿势跟浪的角度相同仿佛融入了瓯江。

When I got on the ship, I found that the steps on the ship were 90 degrees, the lifebuoy hanging on the ship was 360 degrees red and white, and the yellow waves on the river were 180 degrees semicircular, as if Kuafu was running to the sea. With the sound of "Du", the boat started, and vaguely saw two people swimming towards the island in the middle of the river. The swimming posture and wave angle were the same as if they were integrated into the Oujiang River.

船靠岸了，让我惊喜的发现从远处看江心屿是那样小，而进去就变得不同，我们来到了东塔，我绕着塔走了两圈，发现塔身有6个角，那每个角多少度呢？带着这个问题我一边走一边思考：六边行的总外角是360度，那一个外角是360度除以6=60度，一个内角是180度-60度=120度。还有另一个方法是：六边行的圆心是360度，把六边行按圆心分成6个角，一个角是360度/6=60度，下面两个对角也是60度，六边行一个角等于60度+60度=120度。两种方法得出的结果一样，我特别开心，也使我对角的理解更深了！

When the boat docked, I was surprised to find that Jiangxin Islet was so small from a distance, but entering it became different. We came to the East Tower. I walked around the tower twice and found that there were six corners of the tower. How much was each corner? With this question, I thought while walking: the total external angle of the hexagon is 360 degrees, that external angle is 360 degrees divided by 6=60 degrees, and that internal angle is 180 degrees - 60 degrees=120 degrees. Another method is: the center of a hexagon row is 360 degrees. Divide the hexagon row into six corners according to the center of the circle. One corner is 360 degrees/6=60 degrees, and the next two diagonals are 60 degrees. One corner of a hexagon row is 60 degrees+60 degrees=120 degrees. The results obtained by the two methods are the same. I am very happy and have a deeper understanding of the diagonal!

数学日记 篇2

晚上，妈妈买的鞋架到了，我迫不及待地打开快递袋准备帮妈妈搭鞋架。

In the evening, the shoe rack my mother bought arrived. I couldn't wait to open the express bag to help my mother build the shoe rack.

刚打开包装袋，我就看到了3捆按不同长短分类的管子、9片灰色的长方形垫布、1张带有卡通图片的防尘布和一堆三角扣。我拿起这些配件，研究起来。这时妈妈问我：“爽爽，你看搭1层鞋架需要多少根管子呢？”我灵机一动，脱口而出：“长方形有4条边，所以要2根长管子和2根中长管子，另外要连接第2层，还共需要4根短管子，搭1层一共要2+2+4=8（根）管子。”妈妈又问：“那搭10层要几根管子呢？”“1层8根管子，10层就是10个8，那就是10×8=80（根）啦！”妈妈点点头，又考我：“那10层分别需要都多少根不同长度的管子呢？”。我认真地想了想：“1层要2根长管子、2根中长管子、4根短管子，搭10层需要长管子10×2=20（根），中长管子10×2=20（根），短管子10×4=40（根）。”妈妈对我竖起大拇指。算好了之后，我就认真地搭了起来。

As soon as I opened the packaging bag, I saw 3 bundles of pipes classified by different lengths, 9 pieces of gray rectangular pads, 1 piece of dust-proof cloth with cartoon pictures and a pile of triangle buttons. I picked up these accessories and studied them. Then my mother asked me, "Shuangshuang, how many pipes do you need to build a shoe rack?" I had a brainstorm and blurted out: "A rectangle has four sides, so we need two long pipes and two medium long pipes. In addition, we need four short pipes to connect the second floor. A total of 2+2+4=8 pipes are needed to build the first floor." Mom asked again, "How many pipes do you need to build the 10th floor?" "There are eight pipes in one layer, and ten layers are ten eights, that is ten × 8=80! " Mom nodded and asked me, "How many pipes of different lengths do the 10 layers need?". I seriously thought: "Two long pipes, two medium long pipes and four short pipes are required for the first floor, and 10 long pipes are required for the 10th floor × 2=20 (pieces), medium length pipe 10 × 2=20 (pieces), short tube 10 × 4=40 (pieces). " Mother gave me a thumbs up. After finishing the calculation, I seriously set up.

不一会儿我就搭好了1层，妈妈又问：“你搭1层用了5分钟，那搭10层要多少时间？”我挠了挠头：“1层5分钟，10层，当然是，10×5=50（分钟）啦！”时间慢慢地过去了，我一个人把10层都搭好了，接下去只剩下组装了。我花了3分钟把第1层和第2层用三角扣连起来，10层花了9×3=27（分钟）。妈妈故意疑惑地问：“为什么10层是9×3=27，不是10×3=30分钟呢？”我得意地回答：“妈妈，你这就不懂啦，2层需要3分钟，3层需要2个3分钟，以此类推，10层就需要9个3分钟呀！再加上刚才搭鞋架花了50分钟，我一共花了27+50=75（分钟）也就是一个小时15分钟！”

After a while, I finished building the first floor. My mother asked, "It took you 5 minutes to build the first floor. How long will it take to build the 10th floor?" I scratched my head: "1 floor, 5 minutes, 10 floors, of course, 10 × 5=50 (minutes)! " As time went by, I built the 10th floor by myself, and then only assembly was left. It took me 3 minutes to connect the first layer and the second layer with triangle buttons, and it took me 9 × 3=27 (minutes). My mother asked deliberately: "Why is the 10th floor 9 × 3=27, not 10 × 3=30 minutes? " I proudly replied, "Mom, you don't understand. It takes 3 minutes for the second floor, 2 3 minutes for the third floor, and so on. It takes 9 3 minutes for the tenth floor! In addition, it took me 50 minutes to set up the shoe rack, so I spent 27+50=75 (minutes), that is, an hour and 15 minutes!"

妈妈听完我的分析，一边夸我是个聪明能干的孩子，一边给我拍照留念。我不仅一个人搭好了比我还高的鞋架，还用刚学的乘法解决了生活中的数学问题。我开心极了！

After listening to my analysis, my mother praised me as a smart and capable child and took pictures of me as a souvenir. I not only set up a shoe rack taller than me alone, but also solved the mathematical problems in life with the multiplication I just learned. I'm so happy!

数学日记 篇3

刘泽奇

Liu Zeqi

今天妈妈告诉我，鸵鸟是世界上最大的鸟，身高可达5/2米，企鹅的身高约是鸵鸟的6/25，问我企鹅的身高约是多少？我不慌不忙的说出了答案：5/2×6/25=1×3/5=3/5（米）答：是3/5，妈妈夸了夸我，我开心极了！

Today, my mother told me that ostriches are the largest birds in the world, with a height of 5/2 meters. The height of penguins is about 6/25 of that of ostriches. What is the height of penguins? I calmly said the answer: 5/2 × 6/25=1 × 3/5=3/5 (m) Answer: It's 3/5. My mother praised me. I'm very happy!

关于数学日记 篇4

20xx年X月X日晴天

今天我和爸爸妈妈一起去家乐福里面的香村基吃饭，我吃了10元钱的饭，爸爸吃了8元钱的饭，妈妈也吃了8元钱的饭，我们一共吃了26元钱的东西。吃完饭后，我们就到家乐福里面去购物，买了74.5元的全棉双人九孔被、10.8元的建华调和芝麻香油、6.9的光碟、6元的小小光明新鲜奶酪、5元钱的缝纫机针、2.5元锥子、1元钱的缝纫线、45元的伊利低脂高钙牛奶，一共用了151.7元钱，妈妈给阿姨201.7元，阿姨找给妈妈50元。有着清晰的思维，真是太棒了。