How to write an essay on units of length

Three brothers of the length family.

Let's get to know the length family, who are great helpers for math teachers.

They're meters, centimeters, millimeters, you can't take these units of length.

If you use it wrongly, it will be a big joke.

One day, the three members of the long family quarreled, and they all said that they were the king, and Mi said, "Then let's compare who is the king." "Okay, then let's see who is the king, Mi said:

I'm used in many places. When Mi's companion heard this, he said, "Well said."

Centimeter and millimeter were very angry, centimeter took the watch to the stage, kicked the rice **, centimeter said: "Aren't you just a little taller, can you use it to measure small things?" With a hundred of my companions plus me, I can surpass you, and I can measure pencils, and skins, and so many other things, and can you compare with me?

Mi Huo was on fire, and there was fire on his head, and he wanted to punch Centimeter, but Centimeter was smart and clever, and he dodged away and pressed Rice on the wooden board, which was very painful.

Xiao Millimeter also went on stage, it prepared spring shoes for itself, jumped on the stage one by one, and also gave meters and centimeters magnifying glass.

But I could only see a small black dot in the air, and Xiao Millimeter said: "I have energy for things that cannot be measured in meters and centimeters." “

They brought in a man who said, "Only unity is strength." From then on, they were friendly and no longer quarreled.

In math class this week, I learned about the units of length, centimeters and meters. My teacher told me that 1 meter is equal to 100 centimeters, and 1 centimeter is about the same thickness as my math textbook. I've also discovered that there are a lot of things around us that can be measured in these two units.

For example, my desk is about 60 centimeters high, the length of the teacher's lectern is meters, the length of the front and back of the classroom is 8 meters, my height is 130 centimeters, and so on.

When I got home, I happily told my dad about today's discovery, and my dad nodded and said, "Xixi, you have observed very carefully, so what other things have you found in our lives that can be expressed in the units you learned today?" I thought about it and said:

It's a lot, my bed is more than 2 meters long and more than 1 meter wide. Our building is dozens of meters high! ”

What about longer things, like how long is the distance from our home to the Great Wall of Beijing, and what about the distance from the earth to the moon? "Dad Composition.

Dad asked again. This should be thousands, tens of thousands of meters, I can't think of ......"I feel like my brain can't keep up.

"Hehe," said Dad with a smile, "there are many units of length, and meters and centimeters are just the most common of them, and there are longer kilometers, that is, kilometers." The distance from our Earth to the Moon is about 380,000 kilometers. There is also a longer light-year, which is the length of light traveled in a year, which is mainly used to measure the distance between the stars in our universe.

There are also many short units, smaller than centimeters are millimeters, 10 millimeters are equal to 1 centimeter, and smaller microns, 10,000 microns are equal to 1 centimeter. Of course, there are smaller units of length, which scientists use to measure even smaller things, which is very powerful! ”

Ah, there are so many units of length, it turns out that what I learned is only 'a drop in the bucket'! "I was surprised, but I was more interested in learning math.

1. Meter, unit of length, abbreviation (symbol) is: m

1 meter = 10 decimeters = 100 centimeters = 1000 mm.

2. Decimeter, unit of length, abbreviation (symbol) is: dm

1 dm = m = 10 cm = 100 mm.

3. Centimeter, unit of length, abbreviation (symbol) is: cm

1 cm = m = decim = 10 mm.

4. Millimeter, unit of length, abbreviation (symbol) is: mm

1 mm = m = decim = cm.

Commonly used length units: millimeters (mm), centimeters (cm), decimeters (dm), meters (m), kilometers (km).

Kilometers (km) = 1 meter (m).

Meters (m) = 1 decimeter (dm).

10 centimeters (cm) = 1 decimeter (dm).

100 millimeters (mm) = 1 decimeter (dm) 10 decimeters (dm) = 1 meter (m).

Decimeter (dm) = 1 centimeter (cm).

A unit of length refers to the basic unit of measurement of spatial distance.

When measuring the length of a line segment, it is necessary to select a certain line segment as the standard for measurement, and specify its length as 1, and call this trillion line segment as the length unit. There are many units of length, and the international standard unit is the "meter" (symbol "m").

The commonly used units of length are millimeters (mm), centimeters (cm), decimeters (dm), kilometers (km), meters (m), transportation and lease of micrometers (m), nanometers (nm), light years (ly), astronomical units (etc.).

1. Meter, unit of length, abbreviation (symbol) is: m

1 meter = 10 decimeters = 100 centimeters = 1000 mm.

2. Decimeter, unit of length, abbreviation (symbol) is: dm

1 dm = m = 10 cm = 100 mm.

3. Centimeter, unit of length, abbreviation (symbol) is: cm

1 cm = m = decim = 10 mm.

4. Millimeter, unit of length, abbreviation (symbol) is: mm

1 mm = m = decim = cm.

The units are m, cm, mm.

The definition of "m" originated in France. The length of 1 meter was originally defined as one ten-thousandth of the distance from the Earth's equator to the North Pole on the meridian through Paris, and was subsequently identified with the International Meter Prototype. With the deepening of people's understanding of weights and measures, the definition of the length of the meter has been revised several times.

Since 1983, the length of the meter has been defined as "the distance traveled by light in a vacuum in 1 299 792 458 seconds".

A centimeter is a unit of length measurement that is equal to one hundredth-shaped fraction of a meter. The unit of length, abbreviated as cm, 1 cm = 1 100 meters. 1cm (cm) = 10mm (mm) = dm) = m).

The unit of length refers to the basic unit of measuring the distance in space, and it is the basic unit formulated by human beings in order to standardize the length. Its SI unit is "meter" (symbol "m"), and the commonly used units are millimeters (mm), centimeters (cm), decimeters (dm), kilometers (km), meters (m), microns (m), nanometers (nm) and so on. Units of length play an important role in various fields.

Commonly used units of length are: kilometers (also called kilometers), miles, meters, decimeters, centimeters, millimeters, microns, nanometers.

1 km = 1000 m.

1 meter = 10 decimeters = 100 centimeters = 1000 millimeters = 1000000 microns = 100000000 nanometers.

1 decimeter = 10 centimeters.

1 cm = 10 mm.

1 mm = 1000 μm.

1 micron = 1000 nanometers.

1 km = 2 miles.

1 km = 500 meters.

The traditional units of length are feet, inches, minutes, and centimeters.

1 foot = 10 inches = 100 minutes = 1000 centimeters.

1 inch = 10 points.

Minutes = 10 cents.

In addition, in the United Kingdom and the United States, miles, yards, feet, and inches are also used.

Is it in the quiz? I guess it's "you can also write cm". It depends on the way the question is asked.

After school, Xiong Er happily walked home with his schoolbag on his back.

As he walked, he said to himself: "We learned the units of length today: millimeters, centimeters, decimeters, meters, and kilometers.

Let me think about it, how many kilometers is my house from the school? One kilometer = 1000 meters, I walk every 10 minutes, I can walk 1000 meters, every time I come to school to walk for half an hour, that is, 30 minutes, indicating that my home is 3000 meters away from the school, that is, 3 kilometers, haha, I want to teach Xiong Da well when I go home. ”

Xiong Er muttered like this and arrived home unconsciously, and he carefully looked at the door of his tree hole at the door of his house to see how wide it was: "1 decimeter = 10 centimeters, which is also the width we said at a glance, let me think about ......."Suddenly, Xiong Da interrupted Xiong Er's thoughts and shouted, "Xiong Er, what are you doing at the door?"

Why don't you come in? ”

Xiong Er happily said to Xiong Da: "We learned the five length units of millimeters, centimeters, decimeters, meters, and kilometers today, and I will tell you about them as a teacher now: 1 kilometer = 1000 meters, 1 meter = 10 decimeters, 1 decimeter = 10 centimeters, 1 centimeter = 10 millimeters, so 1 meter = 100 centimeters = 1000 millimeters, 1 decimeter = 100 millimeters."

Xiong Da gave a thumbs up and said, "You little teacher is really good!" Let's go teach the bald strong brother!

Children, what do you think of Xiong Er's learning?