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Variability Is the Rule a Companion Analysis of K-8 State Mathematics Standards is written by John P. Smith III and published by IAP. It's available with International Standard Book Number or ISBN identification 1617351997 (ISBN 10) and 9781617351990 (ISBN 13).
This volume analyzes state mathematics curriculum frameworks for grades K-8, focusing on geometry, measurement, probability, and statistics. It highlights variability in grade-level expectations and the challenges of interpreting standards, especially with the shift to Common Core Standards.