Positive real numbers are generally correct numbers, and positive numbers are mathematical terms. 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.

origin

People often encounter various quantities with opposite meanings in their lives. For example, there are surpluses and deficits in bookkeeping; When calculating the rice stored in the granary, sometimes you should remember the grain and sometimes you should remember the valley. For convenience, people think that numbers have opposite meanings. So people introduced the concepts of positive number and negative number, and recorded the excess money as positive number of grain and the loss of money and grain as negative number. It can be seen that both positive and negative numbers are produced in production practice.