First, between two units of measurement of the same kind, if the superior unit is several times that of the subordinate unit, then this value is called the ratio between the two units.

1. When rewriting the company name, the propulsion rate will be used. The method is:

(1) advanced nomenclature× rate = low nomenclature;

(2) Low nominalization rate = high nominalization number.

1 adjacent? Two commonly used ones? The propulsion rate of the length measurement unit is 10. (1 cm = 10/0mm)

2 adjacent? Two commonly used ones? The propulsion rate of the area measurement unit is 100. (1 cm2 = 100 mm2)

3 adjacent? Two commonly used ones? The ratio of quality measurement unit is 1000. (1 kg =1000g)

Second, the advanced unit is the title of the comparative unit of measurement. Among similar units of measurement, the larger unit of measurement is called the larger unit of smaller unit of measurement; On the contrary, smaller units of measurement are called lower units of larger units of measurement. ?

1, property

Higher units and lower units are relative. A unit of measurement can be a high-level unit of one unit of measurement or a low-level unit of another unit of measurement. For example, minutes are high-level units of seconds and low-level units of hours.

For example, 2

Common length units are kilometers, meters, centimeters and millimeters. So there is

(1) For meters, centimeters and millimeters, kilometers are high-level units, and meters, centimeters and millimeters are low-level units;

(2) The meter is a high-level unit of centimeters and millimeters, and centimeters and millimeters are low-level units;

(3) For millimeters, centimeters are high-level units and millimeters are low-level units.

Extended data:

Multiplication algorithm

1, integer multiplication operation satisfies: commutative law, associative law,? Law of distribution, law of elimination.

With the development of mathematics, the object of operation has developed from integer to more general group. Intra-group multiplication is no longer needed to satisfy the commutative law. The most famous noncommutative example is the quaternion group discovered by Hamilton. But the law of association is still satisfied.

(1), multiplicative commutative law:

Note: letters are multiplied by letters, and the multiplication sign can be written without writing.

(2) Multiplicative associative law:

(3) the law of multiplication and distribution:

2. Law of multiplication: two numbers are multiplied, the same sign is positive, the different sign is negative, and the absolute value is multiplied.

Baidu encyclopedia-forward speed

Baidu Encyclopedia-Advanced Unit

Baidu encyclopedia-multiplication