A positive number refers to a number greater than zero, which is used to indicate something with quantity or size, such as 1, 2, 3, etc. Positive numbers are usually used to express concepts such as increase, positive numbers and surplus. For example, if the bank account has 100 yuan, the account balance is positive.
Negative numbers refer to numbers less than zero, which are used to express concepts such as loss, reduction or negative direction, such as-1, -2, -3, etc. Negative numbers are usually used to indicate debt, temperature drop and the opposite direction. For example, the bank account is overdrawn in 50 yuan, and the account balance is negative.
Zero (0) is neither positive nor negative, indicating that there is no concept of quantity or size. Located between positive and negative numbers on the number axis, it can be regarded as the dividing point of positive and negative numbers.
In mathematics, positive numbers and negative numbers represent the relative positional relationship on the number axis. On the number axis, positive numbers are on the right side of zero, and negative numbers are on the left side of zero, which are infinitely far apart.
Positive numbers and negative numbers also have specific rules in mathematical operations. For example, two positive numbers add up to get a positive number and two negative numbers add up to get a negative number. When positive and negative numbers are added, the positive and negative results are determined by the number with larger absolute value.
Application of positive and negative numbers
1. Mathematical operations: Positive numbers and negative numbers play an important role in mathematical operations. You can add, subtract, multiply and divide. Positive numbers add up to positive numbers, negative numbers add up to negative numbers, and the addition of positive numbers and negative numbers depends on the relationship between absolute values. Similarly, there are specific rules for addition, subtraction, multiplication and division of positive and negative numbers.
2. Temperature measurement: Temperature is a common application field, in which positive and negative numbers are used to represent temperature. Positive and negative numbers are used to represent degrees Celsius and degrees Fahrenheit. A positive number represents a higher temperature and a negative number represents a lower temperature. For example, in degrees Celsius, 0 degrees represents freezing point, positive numbers represent temperatures above freezing point, and negative numbers represent temperatures below freezing point.
3. Financial management: Positive and negative numbers play an important role in financial management. Positive numbers are usually used to represent income, assets and profits, while negative numbers are used to represent expenses, liabilities and losses. Through the corresponding calculation and comparison of positive and negative numbers, it can help to make financial planning, budget control and investment decision.