Answer
$9$
Work Step by Step
Factor each number to get:
$27=3\times3\times3$
$72=3\times3\times2\times2\times2$
Thus we can find gcd=$3\times3=9$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.