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A formative assessment lesson (also known as a classroom challenge) is a carefully designed lesson intended to both support teachers in examining how students understand the mathematics of the unit and simultaneously give students opportunities to revisit and deepen their understanding of that mathematics.
These lessons were created by the Mathematics Assessment Project and were carefully tested in classrooms around the world. As such, we do not recommend teachers make modifications to either the structure of the lessons or the materials used during the lessons as this may disrupt how the lessons support students. This guide provides more information on how to use these formative assessment lessons.