computers, calculators
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Positive numbers, on your door. Negative in your freezer.
by using the thermostat
The pages in the book my grand-daughter likes to have me read to her when she visits.
Negative numbers are extremely important for indicating deficit. If I have a certain number of bricks, and a certain number needed for a house, then if I do a simple sum and find that the number of bricks left over after building the house will be -320, then I know I don't have enough bricks, and need to buy 320 before the house can be built. If I get a bank statement that says my current balance is -£89 then this means I owe the bank £89. If I work out the percentage change in the number of people dying from flu each year, and it comes to -1.4%, then I know fewer and fewer people are dying from flu, and whatever action is being taken seems to be working. These are just 3 examples in which negative numbers are very important.
Plants die fast inside of a house because they may not be getting enough sunlight. Plants may also die if the temperature inside of the house is too hot or cold.