This is a digital activity. It is a puzzle in Google Sheets. There are 15 questions. 5 questions have the square root of a negative number, 5 questions have "i" with positive exponents, and the last 5 questions are "i" with negative exponents. Students are asked to simplify the complex numbers. As the students answered the questions correctly the box turns green and part of the picture is being revealed. If they answered incorrectly the box turns red. Thus, this activity gives direct feedback to the students.

You can share this with the students using google classroom (always make a copy for each student) or via email (change the last part of the link to copy) or any teach platform.