This is a great printable activity to use at the beginning of the school year as a "get-to-know-you" activity.
This printable can be used with standard 70mm post-it notes, when printed in A3. Students start by drawing a picture of themselves in the middle. Then, they add their numbers in each box. Finally, they write expressions on post-its that equal the numbers in each box. I would suggest that students us a variety of operations, and encourage to challenge themselves.