Final answer:
An equation that represents the comparison that 81 is 9 times as many as 9 is explained using relevant information.
Step-by-step explanation:
An equation that represents the comparison that 81 is 9 times as many as 9 is:
81 = 9 x 9
In this equation, 81 is the product (result of multiplication) of 9 and 9, which represents that 81 is 9 times as many as 9.
Learn more about Multiplication of numbers