Positive numbers are numbers that are greater than 0. They can be written with or without a positive sign. Negative numbers are less than 0. They are always written with a negative sign.
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Practice makes perfect
Positive numbers are numbers that are greater than 0. They can be written with or without a positive sign. Negative numbers are less than 0. They are always written with a negative sign. Here are some examples of both kinds of numbers.
With this information in mind, we want to write a positive or a negative integer that represents the given situation. Remember that integers are the set of whole numbers and their opposites.
An elevator goes up 12 floors
The word up tells us that the elevator goes above a certain level. This means that the altitude of the elevator is increasing. To express the increase of an amount, we use a positive number.
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Extra
Opposite Numbers
Two numbers that are the same distance from 0 on a number line, but on opposite sides of 0, are called opposites.
Opposite numbers have the same absolute value. Absolute value is what we call the distance that a number is from 0.
|-12|=12 and |12|=12
