CCSS.Math.Content.2.OA.B.2
Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.
Recent CCSS.Math.Content.2.OA.B.2
Doubles - Addition and Subtraction Strategies Unit
Activity, Assessment, Handout, Lesson Plan | Grades K-2
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