The Number Strips Puzzle asks: Can you rearrange the order of the seven strips so that each row contains a correct mathematical statement? Note that the strips containing operators can be inverted if necessary.
I found this number strips puzzle in Ivan Moscovich’s The Big Book of Brain Games. This book weighs several pounds and is chock-full of SO many puzzles that can be used with students! Used copies are available from Amazon for relatively cheap.
I typed up the number and operation strips on two different colors of paper.
I use ceramic disc magnets with all of my puzzles that I buy in bulk from Amazon. They are reasonably priced and strong to hold things up without them sliding down the dry erase board. I’m getting close to finishing up my 2nd box of 200 magnets, so to say that I love these magnets is an understatement.
These are the operator strips that can be inverted if necessary in order to solve the number strips puzzle.
Free Download of Number Strips Puzzle
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 firstname.lastname@example.org with information about what you teach and where you teach. I will be happy to forward an answer key to you.