Addition and Subtraction Presents models and algorithms for addition and subtraction of whole numbers and uses number properties in several common mental calculating and estimating techniques for these operations.Subsections: Models for Addition Algorithms; Number Properties; Inequality of Whole Numbers; Models for Subtraction Algorithms; Mental Calculations; Estimation of Sums and Differences; Problem-Solving Application.One-page Math Activity: Addition and Subtraction with Base Five Pieces | ||||||
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