The highest elevation in North America is Mt. McKinley, which is 20,320 feet above sea level. The lowest elevation is Death Valley, which is 282 feet below sea level. What is the distance from the top of Mt. McKinley to the bottom of Death Valley?
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Integers, odd integers, negative integers, odd negative integers, rational numbers, negative rational numbers, real numbers, negative real numbers, square roots of 1, etc.
Every counting number, and the negative of it, are real, rational integers.
Counting, checking your bank account what has been deducted, reading a weather report, or even when you check your weight. The integers are positive and negative numbers we use in life.
There are many situations where integers are simply not enough. However, "real numbers" are mainly of theoretical importance; for most practical situations, numbers that have a limited number of decimals work quite well.
A negative number times a negative number gives you a POSITIVE number, not a negative number.