I originally suggested that our group would use more cups accurately. But I can't find the cup. Later, this group of people chose the method of grasping by hand. Team member Luo Guangyuan is responsible for catching. Oh, dear! Luo Guangyuan's little hands are quite big! One catch is 180 grains, and 30 consecutive catches have just finished 1 kg of soybeans. Finally finished. 30 180 equals 5400 capsules. So I know there are about 5400 1 thousand soybeans.
This practical activity inspired me. I might as well try melon seeds, candy and peanuts. In fact, math problems are closely related to life.
There is a problem in today's math homework to weigh a pair of shoes. So I went to my mother and asked for a scale. Mom said she didn't have weighing scale. What shall we do? However, as the saying goes, "Nothing is difficult in the world". I think there must be a way.
So, I used my clever brain and came up with a homemade balance.
I cut off the paper covers of the empty moon cake box piece by piece, put on transparent tape, folded one of the paper covers into a regular triangle and put it on the table. Another piece of paper is made into the left and right disks of the balance and placed on the triangle in a balanced way. Then find something with weight at home as a weight. For example, my mother bought toothpaste, lipstick and other items, including 120g, 40g, 18g, 3g.
I'm very excited to say that the shoe activity has started. I put the shoes on the left side of the homemade balance and the "weight of goods" on the right side. It is best to balance the weight on both sides. Then the sum of the weights is the weight of my shoes. Exactly 86 grams. Hard work pays off! I finally finished my math homework. Mom praised me when she found out. Also jokingly said to me: "In ancient times, there was a clever Cao Chong as an elephant, and in modern times, there is a clever Hung Hung as a shoe!" " "Say that finish, everyone laughed.
It turns out that there are scales everywhere in life!
The annual math contest began. The forest is very lively. This year's contestants are: cotton seed, turtle, tiger and lion.
The game has already started. Teacher Swan first gave each of these candidates a test paper, and then said to them, "Whoever can calculate correctly and quickly in a certain period of time will win the Wisdom Cup Award."
As soon as Mr. Swan finished. These candidates began to write. Rabbits run fast and do fast. I saw that she was very clever and soon finished more than half of it. Come on, let's have a look at its test paper. "dizzy! ! ! "You see: 80-70= 150, 20 ÷ 4 = 80 ... What a mess! I didn't even see the operation symbols clearly.
Look at lions and tigers. Hey! Why don't you see lions and tigers? I only saw a lot of manuscripts. Before I left, I saw lions and tigers busy! It turns out that every time a lion does something, he has to take out the manuscript paper to calculate. The more manuscripts are piled up, the more lion heads are hidden. Really simple-minded, developed limbs. Tigers are more exaggerated. Every time I finish a question, I will take out my manuscript and check it. No wonder you are sweating.
Finally, let's look at the tortoise!
The tortoise is usually slow-tempered, but this time its thinking is not slow at all. See how wonderful this question is: 3456-999 = 3456-1000+1= 2457. The tortoise uses a simple algorithm to finish the test paper quickly, and it is right and fast!
Finally, the tortoise won the wisdom prize.