Positive number is a mathematical term. Numbers greater than 0 are called positive numbers, and 0 itself is not a positive number. Positive numbers and negative numbers represent quantities with opposite meanings. Positive numbers are usually preceded by a "+"symbol, which can usually be omitted. Negative numbers are marked with minus sign "-"and positive numbers, such as? 2 stands for the antonym of 2. On the number axis, positive numbers are all on the right side of 0, and the earliest record of positive numbers is China's ancient mathematical work "Nine Chapters Arithmetic". In the calculation, it is stipulated that "positive calculation is red and negative calculation is black", that is, red calculation is used to represent positive numbers and black is used to represent negative numbers. Comparing the sizes of two negative numbers, the absolute value is larger but smaller. ?

There are countless kinds of positive numbers, including positive rational numbers and positive irrational numbers. Positive rational numbers include positive integers and positive fractions.

Geometric meaning of positive numbers: all points representing positive numbers on the number axis are on the right side of the origin on the number axis.

Positive numbers are positive real numbers, including positive integers, positive fractions (including positive decimals) and positive irrational numbers. And positive integers are only a small part of positive numbers.

Positive numbers do not include 0, which is neither positive nor negative. Anything greater than 0 is positive.

If all positive numbers are greater than zero, then all positive numbers are greater than negative numbers. Zero is neither positive nor negative. Then -a

There is neither a maximum number nor a minimum number in positive numbers.

The plus sign before a positive number equals the absolute value of the positive number and the positive number itself.

Such as 2, 5.33, 45, etc. The absolute value of 2 is 2, the absolute value of 5.33 is 5.33, the absolute value of 45 is 45, and so on.

The score can also be a positive number, such as 2/5.

The square root of a positive number is also represented by a positive number. (Note: Negative numbers in the real number range have no square root)

The smallest positive integer is: 1.

There is no maximum positive integer.

computation rule

Plus: positive number 1+ positive number 2= positive number.

Positive number+negative number = the sign takes the sign of the addend with larger absolute value, and the numerical value takes the addend with larger absolute value minus the addend with smaller absolute value.

Subtraction: positive number 1- positive number 2: If the positive number 1 on the real axis is on the right side of positive number 2, the result is greater than 0 and it is a positive number; Otherwise, it is negative if it is less than 0.

Negative number 1- positive number 2 =- (positive number+negative number) = negative number The subtraction of two numbers with different signs is equal to the sum of their absolute values.

Multiplication: positive number 1× positive number 2= positive number.

Positive number 1× negative number 2= negative number

Division: positive number 1÷ positive number 2= positive number.

Positive number1negative number 2= negative number

Generally speaking, dividing by the same symbol equals a positive number, and dividing by different symbols equals a negative number.

Related content

The square of 1.a, the square of any non-zero number must be greater than 0, that is, it must be a positive number.

2. The absolute value of a (|a|=a) The absolute value of any non-zero number must be greater than 0, that is, it must be a positive number.

3. the root number a, the square root of any positive number must be greater than 0, that is, it must be a positive number.

The above three kinds of positive numbers are commonly used in junior high schools, where a is not equal to 0, but equal to 0.