Answer
xy
Work Step by Step
To find the GCF, factor each number. The product of the common factors is the greatest common factor.
$xy^2=\underline x \times \underline y \times y$
$xy=\underline x \times \underline y$
$x^3y^3=\underline x \times x \times x \times \underline y \times y \times y$
