What is a positive number?
Numbers greater than 0 are called positive numbers. Positive numbers are often preceded by a symbol "+",which can usually be omitted. On the number axis, all positive numbers are on the right side of 0.
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.
Properties of positive and negative numbers
(1) All positive numbers are greater than zero and all negative numbers are less than zero, so all positive numbers are greater than negative numbers.
(2) There is neither a maximum number nor a minimum number in positive numbers.
(3) There is neither a minimum number nor a maximum number in negative numbers.
(4) The plus sign before the positive number is equal to the absolute value of the positive number and the positive number itself.
(5) The minus sign before the negative number is equal to the absolute value of the negative number.
(6) The square root of a positive number is also represented by a positive number. The square root of a negative number is represented by the imaginary unit "I".
(7) The smallest positive integer is: 1. There is no smallest positive number.
(8) The largest negative integer is-1. There is no smallest negative number.
What is a negative number?
Numbers less than 0 are called negative numbers, and negative numbers are marked with negative signs "-"and positive numbers. On the number axis, all negative numbers are to the left of 0.
A negative number is the reciprocal of its absolute value. Comparing the sizes of two negative numbers, the absolute value is larger but smaller.
Geometric meaning of negative numbers: all points representing negative numbers on the number axis are on the left of the origin on the number axis.
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