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Hidden Equation Puzzle 2

hidden equation puzzle erich friedman

It’s been almost two years since I last shared a hidden equation puzzle with you. These hidden equation puzzles are the product of Erich Friedman, a math professor and prolific puzzle creator. You can read more about Hidden Equation Puzzle 1 here.

I was introduced to these hidden equation puzzles through Puzzle Box, Volume 2. This trio of three books that was put together by the Grabarchuk Family is by far my favorite source of puzzles for use in the math classroom.

I like to put these puzzles in a dry erase pocket for easy puzzling. You could easily use these in an online setting, as well!

If you don’t have a classroom set of dry erase pockets, you could also use heavy duty sheet protectors. But, I highly recommend investing in a classroom set of the pockets since they are so much more durable.

The task of the puzzle is to circle one symbol in each column so that a true equation results reading from left to right.

Digital Version of Hidden Equation 2 Puzzle

Kathy Henderson created a digital version of the Hidden Equation 2 Puzzle in Desmos.

Puzzle Solutions

I intentionally do not share solutions to the puzzles I feature on my website because I strive to provide learning experiences for my students that are not google-able. I would like other teachers to be able to use these puzzles in their classrooms as well without the solutions being easily found on the Internet.

However, I do recognize that us teachers are busy people and sometimes need to quickly reference an answer key to see if a student has solved a puzzle correctly or to see if they have interpreted the instructions properly.

If you are a teacher who is using these puzzles in your classroom, please send me an email at with information about what you teach and where you teach. I will be happy to forward an answer key to you.