Elementary School Mathematics Essay 55, Elementary School Mathematics Composition

Today, I went to school to register and went home, wrapped my book covers, and began to calculate the expenses I spent this semester.

The first is tuition. The tuition fee is 410 yuan, plus 20 yuan for drinking water, a total of 430 yuan. Then there is the Olympiad Mathematics School's fee of 180 yuan, and it is estimated that there will be 20 yuan for the ride, a total of 200 yuan.

There is also money for exercise books: 2 yuan for "Lesson Pass"; "English Practice" 1 yuan; 2 copies of "Examination Paper Lessons"; "Jiangsu Big Test Paper" 3 books 21 yuan. meta).

Study fee: 430 + 200 + yuan).

Living expenses: I will drink about 5 cartons of milk this semester, 5 30 = 150 (yuan). Each meal is about 2 3 yuan, count it as yuan, yuan).

What else? I bit my pencil and muttered to myself, "And your school supplies." "Hey, Mommy is back.

That's right, and school supplies.

School supplies: 8 yuan for a pencil case, 3 yuan for a pencil case (very cheap, clearance goods), 3 yuan for six pencils, 1 yuan for a rubber dollar, 1 yuan for two triangular rulers, 5 yuan for two mechanical pencils, 8 + 3 + yuan).

Total expenditure: RMB).

Wow, I didn't expect that I, who usually don't spend much money, would let my parents spend yuan on my semester. Looks like I'm going to have to save money!

Today, my mom and I went to the supermarket, I jumped to the children's area, looked at the toys one by one, bought two guns, each yuan, my mom bought 1 mop, we spent a total of 27 yuan, each mop is yuan, we went home after buying.

Beautiful math.

At noon today, in order to measure the volume of chopsticks more accurately, I asked my father to take a slender graduated cylinder from the chemistry room, and the scale unit is smaller, each unit is only 1 cubic centimeter. At this point, I seemed to feel that victory was beckoning to me, and I really had everything in place, and I just had to experiment with it.

First, I drew a dividing line with a pencil on the disposable chopsticks, divided the chopsticks into two equal sections, and soaked them in water so that the chopsticks would not be washed during the measurement. Subsequently, insert the chopsticks into the graduated cylinder, and use a dropper to drop the water into the graduated cylinder, let the water in the graduated cylinder rise to the dividing line of the chopsticks, write down the water level scale (38 ml) in the measuring cylinder, take the chopsticks out of the measuring cylinder, and then write down the water level scale (ml) in the graduated cylinder, the difference between the two water level scales before and after is the volume of this part of the chopsticks, that is, cubic centimeters. Using the same method, I measured the volume of the other part of the chopsticks to 5 cubic centimeters, and the volume of the two pairs of chopsticks was added to the cubic centimeters.

When I got this result, I exclaimed excitedly, how proud, proud I was at this time!

Then, I calculated the amount of disposable chopsticks consumed by our school (1,500 people) and the whole country (1.2 billion) in a year based on the use of 3 pairs per person a day, which were cubic meters and 11,169,000 cubic meters respectively. I was amazed at how much wood is wasted every year to make disposable chopsticks! Here, I appeal to the students in the school, no!

It's the people of the whole country, and it's not! It should be that everyone in the world should stop using disposable chopsticks, only in this way can we protect our forest resources, make our shared global environment better, and let everyone on the earth breathe clean and fresh air.

300-400 words is too much! Can it be less.

In fact, it is not difficult to write a primary school math essay, it is a matter in life, which has mathematical knowledge of corresponding difficulty, and it is enough to solve a problem or have a revelation.

Math essay? What?