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Houghton Mifflin Harcourt Into Math, Grade 1 © 2020

12.6 Represent Make Ten to Add . 12.7 Represent Make Ten to Add with a Visual Model . 13.1 Use a Hundred Chart to Show TwoDigit Addition and - Subtraction 13.2 Understand and Explain Place Value Addition . 13.4 Solve Two-Digit Addition and Subtraction Problems . 13.6 Practice Two-Digit Addition and Subtraction