This is a bundle of all of my Super Secret Calculus Puzzles.
In these puzzles, students solve somewhere between 6 and 10 problems. After they solve the problems, they add up their solutions - this is the super secret number. Each puzzle has a super secret number QR code that can be printed and posted in the classroom. Students can scan to see if their Super Secret Number matches my super secret number. If it does, they have probably solved all of the problems correctly.
The QR Code does not have to be used - you can just tell the students the Super Secret Number if necessary.