This week’s puzzle is a “shape puzzle.” To fill in the shape puzzle, you need to fill in every blank shape. Moreover, the same shape in the puzzle must always contain the same number: so, for example, if one of the squares contains a 3, so must every other square.

Shape puzzles are a staple in my teaching, because they both gently introduce children to algebraic concepts and allow kids to use backwards instead of forwards reasoning. Backwards reasoning always requires more fluency and understanding, and as a result, it’s very worth practicing once an initial mental model is in place.

You can click on the picture above to open a pdf of the puzzle.

Here’s the solution to the puzzle:

Please let me know if you have requests for specific puzzles (types of puzzles, operations used in puzzles, numbers used in puzzles, etc.) in the comments!