For example, below 6℃, use -6℃.

2. The underground part of the building, the underground floor is represented by-1 floor.

For example, the parking lot in the basement can be expressed as:-1 floor.

3. The height below sea level is expressed by negative numbers.

For example, the height of Mount Everest is 8844 meters above sea level; The altitude of Turpan basin is-155 meters.

4. Liabilities can be expressed in negative numbers.

For example, Xiao Zhang owes Xiao Yang 100 yuan, which is-100 yuan.

5. The water level rise is represented by a positive number, and the water level drop is represented by a negative number.

For example, the water level drop is represented by-10CM.

6. The increase/decrease of output can be represented by a negative number.

For example, the reduction in production is represented by -500 kg.

7. Scores/deductions can be expressed in negative numbers.

For example, a deduction of 5 points is indicated by -5.

Extended data:

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.