Why was the multiplication created?

How many 9 are there in 100? What is the perimeter of yard that is 9 yards in width and 13 yards in length? Do positive numbers on a grid go left or right? What type of writing is best illustrated in a Venn diagram? What does benchmark fractions mean? How old were you in 2005 if you were born in 1988? Using the numbers 1 through 9 make a frcation that equals one third? What is January 4th in roman numerals? What line passes through 2 parallel lines? At a park 96 bags were gave out in 30 minutes if 29 bags remain and x represents the starting number of bags what equation could be used to determine the value of x? What is the scientific notation of 00065? How do you write 60 4 0.07 in standard form? What is two thirds of an acre? What do you call the highest tip of a triangle? How much degree 11 percent? Is 58 the same as 0.58? What is a 2-dimensional surface with one side called? When you find a scheelite what do you do? What is the square root of nine minus two divided by ten? What is the range of absolute value functions My teacher said it would be all real numbers. However I thought it would be positive real numbers. Can you explain who is right and why?