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The 3Rs—Reading, wRiting, and aRithmetic—have been foundational in education for thousands of years. My recent book, The Fourth R, adds to that list Reasoning/computational thinking. It concerns using human brains and computer brains, individually and working together, to solve problems and accomplish thoughts. Like each of the traditional 3Rs, computational thinking is both a discipline of study and a fundamental cognitive tool.
The array model, used throughout Bridges, is the subject of “Arrays, Multiplication and Division” by Jennie Pennant from nrich.maths.org. The piece outlines how the array model supports development of a sense of multiplicative relationships and describes how to move students from building multiplication facts and tables to exploring division as the inverse operation of multiplication.