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This is a matching puzzle, also known as a Tarsia. Please see my other puzzles, most of which deal with trigonometry and calculus, with some precalculus thrown in, too.
There are two types of expressions, complex numbers in a + bi form, and multiplication or division expressions yet to be reduced to a + bi form. Students match unreduced expressions with the proper reduced expressions in a + bi form. The final shape is a parallelogram.
Instructions (time is approximately 30 - 45 minutes):
1. Print each puzzle (two pages), using single-sided printing.
2. Students cut out all triangles, from each of the two sheets.
3. Students match unreduced expressions to their equivalent reduced forms, back to back, like one would put together a jigsaw puzzle. The puzzle can be put together in only one way, as each expression, reduced or otherwise, occurs only once.