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학생 지침
Use the 
tool to slide the magnifying glass around and reveal the hidden numbers!
When you find a product of 10, change the color to make it visible.
Watch the video to see how it is done.
When you are finished and have changed the color of all of the products of 10, you may submit! 
선생님 메모 (학생들에게는 보이지 않음)
I got this idea from Mrs. Talk Techie who used this in google slides. Her tutorial video is here: https://www.youtube.com/watch?v=9LwHs-CSobo.
