Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).
Operations and Algebraic Thinking
Add and subtract within 20.
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Fluently add and subtract within 5.
Represent addition and subtraction concretely.
Represent addition and subtraction with objects, fingers, mental images, drawings, sounds (e.g., claps), acting out situations, verbal explanations, expressions, or equations.
Fluently add and subtract within 20. By the end of Grade 2, know from memory all sums of two one-digit numbers.
Relate counting to addition and subtraction. For example, by counting on 2 to add 2.