Do you know what units there are in mathematics?

There are many mathematical units, for example:

Units of length: millimeters, centimeters, decimeters, meters, kilometers....

Units of area: square Millimeters, square centimeters, square decimeters, square meters, hectares, square kilometers....

Volume units: cubic millimeters, cubic centimeters (ml), cubic decimeters (liters), cubic meters. ....

Time units: seconds, minutes, hours....

Weight units (mass units): grams, kilograms, catties, kilograms, tons....

The traditional units of length in China include miles, feet, feet, inches, xun, Ren, Fu, Yi, Qi, steps, Chang, arrows, feasts, Ji, rails, pheasants, millimeters, centimeters, and minutes ,wait. The basic conversion relationship is as follows:

1 foot = 10 feet; 1 foot = 10 inches; 1 inch = 10 minutes; 1 minute = 10 centimeters;

1 feet ≈ 3.33 meters; 1 foot ≈ 3.33 decimeters; 1 inch ≈ 3.33 centimeters;

1 kilometer (km) = 1000 meters; 1 meter (m) = 100 centimeters; 1 centimeter (cm) = 10 millimeters

1 mile = 150 feet = 500 meters; 2 miles = 1 kilometer (1000 meters).

Extended information:

The order of area units from small to large is: mm? (square millimeters), cm? (square centimeters), dm? (square decimeters), m ? (square meters), hm? (hectares), km? (square kilometers). In the International System of Units (SI), the standard unit of area is the square meter (square meter), which is the area of ??a square one meter long

1 cubic meter = 1000 liters = 1000 cubic decimeter = 1,000 , 000 ml = 1000000 cubic centimeters = 1,000,000,000 cubic millimeters

1 liter = 1 cubic decimeter = 1000 ml = 1000 cubic centimeters = 1,000,000 cubic millimeters

1 cubic foot = 1 (ft?) = 0.0283 cubic meter (m?) = 28.317 liter (liter) = 28.317 cubic decimeter (dm?) = 28317 cubic centimeters = 28317000 cubic millimeters

The unit of time is one of the seven basic units. Length, time, mass, amount of matter, illumination, electric current and (thermodynamic) temperature are the seven basic units. The time units in this entry are listed in ascending order of time.

Nowadays, day and night last for twenty-four hours, but in ancient times, they lasted for twelve hours. When Western mechanical clocks were introduced to China, people called the Chinese and Western time points "big time" and "hour" respectively. With the popularity of watches and clocks, people have forgotten "big time", but "hour" is still used today.

Baidu Encyclopedia - Unit of length

Baidu Encyclopedia - Unit of area

Baidu Encyclopedia - Unit of volume

Baidu Encyclopedia - time unit