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This escape room activity includes four challenges: The first one is adding and subtracting rational equations. The other three are multiplying and dividing. The third challenge uses a de-coder (attached). The fourth challenge uses QR codes, but students can use their camera on their cell phones to scan those. See the preview pages for the difficulty level. Some are easy and some are more difficult.
I use Google Forms for the students to put the clues they found. The Google forms will not let them move on until they put the right clue in. The bit.ly link is included. Please let me know if you need help with this.
You do NOT need locks or lock boxes to do this activity. You need one device per group to put in the clues. If you want to do it without Google forms, the students can show you the clue, then you can pass them off to go to the next activity.