Can someone explain this to a 6th Grader?

Someone in grade 6 came to me with this math question. Its very simple to find the answer, but I am having a hard time explaining it using 6th Grade math material.

Question: Two numbers have a product of 676. The same two numbers have a quotient of 4. What are the two numbers.

Using Algebra I know xy = 676 and x / y = 4 -> x = 4y -> 4y*y = 676 -> y = 13. Therefor x = 52.

The Grade 6'er in question tells me they do not use letters in math, thus I am finding it difficult to explain how to find the answer without using "letters".

djino

"Your help would be appreciated! Thanks!"