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Operations and Algebraic Thinking 1.OA
4.Understand subtraction as an unknown-addend problem. For example, subtract 10 – 8 by finding the number that makes 10 when added to 8.
TM 1.4.7, 1.9.5, 1.9.6, 1.9.7, 1.9.8

List of resources:
http://www.k-5mathteachingresources.com/1st-grade-number-activities.html