Exercise 1 Page 355

Positive numbers are numbers that are greater than $0.$ These numbers can be written with or without a positive sign. Negative numbers are less than $0$ and are always written with a negative sign. Integers are the set of whole numbers and their opposites. Let’s use this information to write a positive or negative integer that represents the given situation.

You walk up $83$ stairs.

The words walk up tell us that we go above certain level. This means that the number of stairs we walked up increased. We use positive numbers to express the enlargement of a number.