Thinking Puzzles
These puzzles get students to think about the operation. They have to look at and reason about the numbers. This flips what we usually do it. We often ask students to solve equations. These puzzles demand that they think about what is happening to the numbers. Make sure that you have students to explain their thinking when doing these. I love these. You can just write them up on your board and tailor them to your grade level. I would also write nontraditional equations as well (answer first or in other ways… see below).
Happy Mathing,
Dr. Nicki
Dr. Nicki's Guided Math Blog 
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