How do you know if the equation for a problem is multiplication

How do you know if the equation for a problem is multiplication? Well, lets go and review: Multiplication is :A mathematical operation performed on a pair of numbers in order to derive a third number called a product. For positive integers, multiplication consists of adding a number (the multiplicand) to itself a specified number of times. Thus multiplying 6. :)

If it uses words like
-area
-multiplied by
-of
-per
-product of
-rate
-times
-triple
-twice