Have you ever seen negative numbers in your life? For example, talk about its significance.

1, temperature. When measuring temperature, take 0 degree as the dividing point, and the temperature below 0 degree is called negative temperature. Below 0 degrees, add a minus sign before the value, for example, -3 degrees means minus 3 degrees or minus 3 degrees. The temperature higher than 0 is called the temperature above zero, and a plus sign is added before the value, such as +5℃, which means 5℃ or 5℃ above zero.

2. Height relative to sea level. The height of sea level is indicated by 0. ? It is 8848 meters higher than the sea level, which is represented by a positive number and is called 8848 meters above sea level. Below sea level 155 meters, expressed in negative numbers, is called elevation-155 meters.

3. Income and expenditure. Income is positive, expenditure is negative, income 5000, recorded as +5000, expenditure 2300, recorded as -2300.