Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).
Operations and Algebraic Thinking
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Fluently add and subtract within 5.
Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.
For any number from 1 to 9, find the number that makes 10 when added to the given number, e.g., by using objects or drawings, and record the answer with a drawing or equation.
Represent addition and subtraction with objects, fingers, mental images, drawings, sounds (e.g., claps), acting out situations, verbal explanations, expressions, or equations.
Relate counting to addition and subtraction. For example, by counting on 2 to add 2.