Identify the opposite of - 16.5 and explain why the two numbers are opposites.

Answer: The opposite of - 16.5 would be + 16.5. The two numbers are opposite because if you look at a number line and take - 16.5 and look on the other side where that number would be its postitive. Therefor being + 16.5

The opposite of - 16.5 is 16.5 because the opposite of a number is just the number on the opposite side of zero on the number line.