To do a simpler problem to find the solution, factorize any of the two numbers into multiplied numbers and simplify.
So try to break down 7 into its factors. Well, we can't do that since 7 is prime and has no other factors.
38, however, has factors that we can simplify 38 into.
7 x 38
7 x 2 x 19
7 x 19 x 2
So the two simpler problems are:
7 x 19 x 2
and
7 x 2 x 19
Hope this helps :)